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Number

1,988

  • Positive
  • Even
  • Composite
  • 4 digits

1,988 is an even 4-digit integer and a composite number. It has 12 divisors and a digital root of 8.

Number properties

ParityEvendivisible by 2
SignPositive
PrimalityComposite
Absolute value1,988
Digit count4
Digit sum26
Digital root8repeated digit sum
PalindromicNoreads differently backwards
Happy numberNosquared-digit sums reach 1
Harshad numberNodivisible by its own digit sum

Factors & divisors

Prime factorisation2^2 × 7 × 71
Distinct prime factors32, 7, 71
Number of divisors12
Sum of divisors σ(n)4,032
Aliquot sum2,044sum of the proper divisors
ClassificationAbundantthe aliquot sum exceeds the number
Euler's totient φ(n)840integers below n that share no factor with it
SquarefreeNohas a repeated prime factor
All divisors1, 2, 4, 7, 14, 28, 71, 142, 284, 497, 994, 1,98812 in total

Arithmetic

Previous number1,987
Next number1,989
Double3,976
Half994
Square3,952,144
Cube7,856,862,272
Square root44.586993619≈irrational, shown to 9 decimal places
Cube root12.573961512≈
Negation-1,988
Reciprocal0.0005030181≈

Representations

Decimal1,988
Binary1111100010011 bits
Octal3704
Hexadecimal7C4
Base 361J8
Roman numeralMCMLXXXVIII
In wordsone thousand, nine hundred and eighty-eight
Ordinalone thousand, nine hundred and eighty-eighth
Scientific notation1.988 × 10^3
Engineering notation1.988 × 10^3

Nearest landmarks

Next prime1,993+5
Previous prime1,987−1
Distance to nearest prime1
Nearest square below1,936
Nearest square above2,025

Powers & multiples

1,988 to the power 23,952,144
1,988 to the power 37,856,862,272
1,988 to the power 415,619,442,196,736
1,988 to the power 531,051,451,087,111,168
First ten multiples1,988, 3,976, 5,964, 7,952, 9,940, 11,928, 13,916, 15,904, 17,892, 19,880
Powers of twoBetween 2^10 (1,024) and 2^11 (2,048)

Divisibility tests

Divisible by 2Yes
Divisible by 3No, remainder 2
Divisible by 4Yes
Divisible by 5No, remainder 3
Divisible by 6No, remainder 2
Divisible by 7Yes
Divisible by 8No, remainder 4
Divisible by 9No, remainder 8
Divisible by 10No, remainder 8
Divisible by 11No, remainder 8
Divisible by 12No, remainder 8
Divisible by 100No, remainder 88

Collatz (3n + 1) trajectory

Steps to reach 124the total stopping time
Highest value reached1,988
Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven
First steps1,988 → 994 → 497 → 1,492 → 746 → 373 → 1,120 → 560 → 280 → 140 → …
Last steps… → 5 → 16 → 8 → 4 → 2 → 1

As a percentage & fraction

As a percentage198,800%
1,988% as a decimal19.88
1,988% of 1001,988
1,988% of 1,00019,880
As a fraction of 1001,988/100

Read another way

As seconds33 minutes and 8 seconds
As bytes1.941 KiB
As a year1988 AD
As a 24-bit colour#0007C4

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Neighbouring numbers

Nearby primes

Also reads as

1988 (year)

  • Leap year
  • 366 days
  • 20th century
  • Dragon

1988 was a leap year of 366 days. It began on a Friday and ended on a Saturday. Easter Sunday fell on 3 April.

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Structure of the year

Leap yearYesdivisible by 4, and by 400 if divisible by 100
Days in the year366
Weeks in the year52ISO 8601 weeks; 28 December is always in the final week
Days in February29
1 January fell on aFriday
31 December fell on aSaturday
Century20th century
Decade1980s
Chinese zodiacDragon
Easter Sunday3 April

Months of 1988

January31 days, starts Friday
February29 days, starts Monday
March31 days, starts Tuesday
April30 days, starts Friday
May31 days, starts Sunday
June30 days, starts Wednesday
July31 days, starts Friday
August31 days, starts Monday
September30 days, starts Thursday
October31 days, starts Saturday
November30 days, starts Tuesday
December31 days, starts Thursday

Time references

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

Unix timestamp at the start567,993,600
Unix timestamp at the end599,615,999
Years from now38 years ago
Days from today14,131 days since 1 January

The number 1988

As a number1,988
In wordsone thousand, nine hundred and eighty-eight
Roman numeralsMCMLXXXVIII

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Neighbouring years

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 visionProtanopiaDeuteranopiaTritanopia
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 10.7Dark cyan · ΔE 11.6Teal · ΔE 14.3Cadetblue · ΔE 19.3Medium aquamarine · ΔE 20.9Sea 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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Every value on this page was computed from “1988” by Nerdulator’s number engine. Nothing here was retrieved from a database of answers or written by a model.