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Recognised as Number

1,989

Positive
Odd
Composite
4 digits

1,989 is an odd 4-digit integer and a composite number. It has 12 divisors and a digital root of 9.

Number properties

ParityOddnot divisible by 2

SignPositive

PrimalityComposite

Absolute value1,989

Digit count4

Digit sum27

Digit product648

Multiplicative persistence4times the digit product can be taken before one digit is left

Digital root9repeated digit sum

PalindromicNoreads differently backwards

Happy numberNosquared-digit sums reach 1

Harshad numberNodivisible by its own digit sum

Factors & divisors

Prime factorisation3^2 × 13 × 17

Distinct prime factors33, 13, 17

Number of divisors12

Sum of divisors σ(n)3,276

Aliquot sum1,287sum of the proper divisors

ClassificationDeficientthe aliquot sum is less than the number

Euler's totient φ(n)1,152integers below n that share no factor with it

Carmichael function λ(n)48the smallest exponent with aˣ ≡ 1 for every unit; smaller than φ(n) = 1,152

Möbius function μ(n)0zero, because a prime divides n twice

SquarefreeNohas a repeated prime factor

All divisors1, 3, 9, 13, 17, 39, 51, 117, 153, 221, 663, 1,98912 in total

Arithmetic

Previous number1,988

Next number1,990

Double3,978

Square3,956,121

Cube7,868,724,669

Square root44.598206242≈irrational, shown to 9 decimal places

Cube root12.576069469≈

Negation-1,989

Reciprocal0.0005027652≈

Representations

Decimal1,989

Binary1111100010111 bits

Octal3705

Hexadecimal7C5

Base 361J9

Roman numeralMCMLXXXIX

In wordsone thousand, nine hundred and eighty-nine

Ordinalone thousand, nine hundred and eighty-ninth

Scientific notation1.989 × 10^3

Engineering notation1.989 × 10^3

In other bases

Ternary2201200base 3; the most digit-efficient integer base after e: 7 digits

Quinary30424base 5; one hand: 5 digits

Septenary5541base 7: 4 digits

Nonary2650base 9; each digit is two ternary digits: 4 digits

Duodecimal1199base 12; divides by 2, 3, 4 and 6, which is why eggs and inches come in twelves: 4 digits

Vigesimal4j9base 20; hands and feet, and the Mayan and Yoruba systems: 3 digits

Sexagesimal33:9base 60; Babylonian, and still how an hour and a circle are divided: 2 digits

Balanced ternary10T1TT00digits −1, 0 and +1 written T, 0 and 1; negation is swapping T and 1, so no sign is needed

Negabinary1100011000101base −2; place values alternate 1, −2, 4, −8, so every integer has exactly one form without a sign

Bit-level

0000011111000101

Bit length11 bitsto write the magnitude

Set bits7the population count, or Hamming weight

Zero bits4within that length

Bit parityodd7 set bits, so odd; not the same as the number itself being odd

Highest set bitbit 10worth 1,024

Lowest set bitbit 00 trailing zeros

Power of twoNo

Bytes207 c5

Gray code10000100111n XOR (n >> 1); successive values differ in exactly one bit

At each machine width

16-bit0000011111000101

32-bit00000000000000000000011111000101

64-bit0000000000000000000000000000000000000000000000000000011111000101

One's complement1111100000111010at 16 bits, every bit flipped

Bits reversed1010001111100000at 16 bits

Rotated left by 10000111110001010at 16 bits, wrapping

Shifted left by 1111110001010= 3,978, no wrap

Shifted right by 11111100010= 994, discarding the low bit

These bits as a double9.8269657 × 10^-321≈IEEE-754 binary64 reinterpretation of the same 64 bits (subnormal)

Nearest landmarks

Next prime1,993+4

Previous prime1,987−2

Distance to nearest prime2

Nearest square below1,936

Nearest square above2,025

Powers & multiples

1,989 to the power 23,956,121

1,989 to the power 37,868,724,669

1,989 to the power 415,650,893,366,641

1,989 to the power 531,129,626,906,248,949

First ten multiples1,989, 3,978, 5,967, 7,956, 9,945, 11,934, 13,923, 15,912, 17,901, 19,890

Powers of twoBetween 2^10 (1,024) and 2^11 (2,048)

Divisibility tests

Divisible by 2No, remainder 1

Divisible by 3Yes

Divisible by 4No, remainder 1

Divisible by 5No, remainder 4

Divisible by 6No, remainder 3

Divisible by 7No, remainder 1

Divisible by 8No, remainder 5

Divisible by 9Yes

Divisible by 10No, remainder 9

Divisible by 11No, remainder 9

Divisible by 12No, remainder 9

Divisible by 100No, remainder 89

Collatz (3n + 1) trajectory

Steps to reach 124the total stopping time

Highest value reached5,9683× the starting value

Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven

First steps1,989 → 5,968 → 2,984 → 1,492 → 746 → 373 → 1,120 → 560 → 280 → 140 → …

Last steps… → 5 → 16 → 8 → 4 → 2 → 1

As a percentage & fraction

As a percentage198,900%

1,989% as a decimal19.89

1,989% of 1001,989

1,989% of 1,00019,890

As a fraction of 1001,989/100

Read another way

As seconds33 minutes and 9 seconds

As bytes1.942 KiB

As a year1989 AD

As a 24-bit colour#0007C5

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Neighbouring numbers

Derived from 1,989

Nearby primes

Other readings

Also reads as

1989 (year)

Common year
365 days
20th century
Snake

1989 was a common year of 365 days. It began on a Sunday and ended on a Sunday. Easter Sunday fell on 26 March.

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Structure of the year

Leap yearNonot divisible by 4

Days in the year365

Days in February28

1 January fell on aSunday

31 December fell on aSunday

Century20th century

Decade1980s

Chinese zodiacSnake

Easter Sunday26 March

Patterns forced by the calendar

Weekday counts52 of each, plus an extra Sunday365 days is 52 weeks and 1 day, and the remainder starts on the weekday 1 January falls on

Sundays53one of the extras

Mondays52

Tuesdays52

Wednesdays52

Thursdays52

Fridays52

Saturdays52

Friday the 13th2 of them13 January, 13 October

ISO weeks52an ordinary 52-week year

Same calendar as1978the most recent year whose calendar is identical, so a printed one could be reused

Calendar repeats in1995, 2006, 20176 years later, then again after that; the gap is 6, 11 or 28 years, broken by centuries that skip a leap year

Months of 1989

January31 days, starts Sunday

February28 days, starts Wednesday

March31 days, starts Wednesday

April30 days, starts Saturday

May31 days, starts Monday

June30 days, starts Thursday

July31 days, starts Saturday

August31 days, starts Tuesday

September30 days, starts Friday

October31 days, starts Sunday

November30 days, starts Wednesday

December31 days, starts Friday

Time references

These values depend on today’s date and change daily.

Unix timestamp at the start599,616,000

Unix timestamp at the end631,151,999

Years from now37 years ago

Days from today13,772 days since 1 January

The number 1989

As a number1,989

In wordsone thousand, nine hundred and eighty-nine

Roman numeralsMCMLXXXIX

Keep nerding

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Neighbouring years

Key dates

Also reads as

#119988 (colour)

#119988
Cyan
Dark
Nearest: Light seagreen

#119988 is a cyan with RGB values 17, 153, 136 and HSL 173°, 80%, 33%. It is a dark colour, so black text on it reaches 5.9:1 contrast (AA for normal text). The nearest named colour is Light seagreen.

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Colour values

#119988#119988

HEX#119988

HEX (short)#198

RGBrgb(17, 153, 136)

RGB (0–1)0.0667, 0.6, 0.5333

RGB percentages6.7%, 60%, 53.3%

HSLhsl(172.5, 80%, 33.3%)

HSV / HSBhsv(172.5, 88.9%, 60%)

CMYK88.9%, 0%, 11.1%, 40%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer1,153,416

CSS custom property--colour: #119988;

Brightness & contrast

Relative luminance0.24679WCAG 2.x, 0 is black and 1 is white

Perceived brightness126.2 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundBlackcontrast 5.94:1

Contrast with white3.54:1WCAG normal text: Fail

Contrast with black5.94:1WCAG normal text: AA

Greyscale equivalent#7B7B7B

Inverted#EE6677

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#928F87no red cones; affects about 1% of men; ΔE 37.2 from the original

Deuteranopia#81838Ano green cones; the most common form, about 1% of men; ΔE 38.1 from the original

Tritanopia#009C94no blue cones; rare, and affects men and women equally; ΔE 5.4 from the original

Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning

Contrast with white, large text3.54:1WCAG large text: AA

Contrast with black, large text5.94:1WCAG large text: AAA

Named colours

Light seagreen · ΔE 10.7 Dark cyan · ΔE 11.6 Teal · ΔE 14.3 Cadetblue · ΔE 19.3 Medium aquamarine · ΔE 20.9 Sea green · ΔE 21.4

Nearest named CSS colourLight seagreen (#20B2AA)ΔE 10.74, a distinctly different colour

Hue familycyan

CSS keyword usableNo exact keyword

Colour harmonies

base +30°+90°+120°+180°+210°+240°+270°+330°

Complementary#991122

Analogous#119944, #116699

Triadic#881199, #998811

Split complementary#991166, #994411

Tetradic#441199, #991122, #669911

Tints, shades & saturation

+40%+30%+20%+10%base -10%-20%-30%-40%

Lighter +40%#85F1E4

Lighter +30%#57ECDA

Lighter +20%#29E7CF

Lighter +10%#16C7B1

Darker −10%#0C6B5F

Darker −20%#073D36

Darker −30%#020F0E

Darker −40%#000000

More saturated +25%#00AA95

Less saturated −25%#268478

Channel breakdown

R17

G153

B136

Red17 (6.7%)

Green153 (60%)

Blue136 (53.3%)

Hue172.5°

Saturation (HSL)80%

Lightness33.33%

Dominant channelGreen

Hex per channelR 11 · G 99 · B 88

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Harmonies

Lighter and darker

Similar named colours

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