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Number

1,987

  • Positive
  • Odd
  • Prime
  • 4 digits

1,987 is an odd 4-digit integer and a prime number. It has 2 divisors and a digital root of 7.

Number properties

ParityOddnot divisible by 2
SignPositive
PrimalityPrime
Absolute value1,987
Digit count4
Digit sum25
Digital root7repeated digit sum
PalindromicNoreads differently backwards
Happy numberNosquared-digit sums reach 1
Harshad numberNodivisible by its own digit sum

Factors & divisors

Prime factorisation1,987
Distinct prime factors11,987
Number of divisors2
Sum of divisors σ(n)1,988
Aliquot sum1sum of the proper divisors
ClassificationDeficientthe aliquot sum is less than the number
Euler's totient φ(n)1,986integers below n that share no factor with it
SquarefreeYesno repeated prime factor
All divisors1, 1,9872 in total

Arithmetic

Previous number1,986
Next number1,988
Double3,974
Half993.5
Square3,948,169
Cube7,845,011,803
Square root44.575778176≈irrational, shown to 9 decimal places
Cube root12.571852849≈
Negation-1,987
Reciprocal0.0005032713≈

Representations

Decimal1,987
Binary1111100001111 bits
Octal3703
Hexadecimal7C3
Base 361J7
Roman numeralMCMLXXXVII
In wordsone thousand, nine hundred and eighty-seven
Ordinalone thousand, nine hundred and eighty-seventh
Scientific notation1.987 × 10^3
Engineering notation1.987 × 10^3

Nearest landmarks

Next prime1,993+6
Previous prime1,979−8
Distance to nearest prime0, it is prime
Nearest square below1,936
Nearest square above2,025

Powers & multiples

1,987 to the power 23,948,169
1,987 to the power 37,845,011,803
1,987 to the power 415,588,038,452,561
1,987 to the power 530,973,432,405,238,707
First ten multiples1,987, 3,974, 5,961, 7,948, 9,935, 11,922, 13,909, 15,896, 17,883, 19,870
Powers of twoBetween 2^10 (1,024) and 2^11 (2,048)

Divisibility tests

Divisible by 2No, remainder 1
Divisible by 3No, remainder 1
Divisible by 4No, remainder 3
Divisible by 5No, remainder 2
Divisible by 6No, remainder 1
Divisible by 7No, remainder 6
Divisible by 8No, remainder 3
Divisible by 9No, remainder 7
Divisible by 10No, remainder 7
Divisible by 11No, remainder 7
Divisible by 12No, remainder 7
Divisible by 100No, remainder 87

Collatz (3n + 1) trajectory

Steps to reach 194the total stopping time
Highest value reached8,9444× the starting value
Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven
First steps1,987 → 5,962 → 2,981 → 8,944 → 4,472 → 2,236 → 1,118 → 559 → 1,678 → 839 → …
Last steps… → 5 → 16 → 8 → 4 → 2 → 1

As a percentage & fraction

As a percentage198,700%
1,987% as a decimal19.87
1,987% of 1001,987
1,987% of 1,00019,870
As a fraction of 1001,987/100

Read another way

As seconds33 minutes and 7 seconds
As bytes1.94 KiB
As a year1987 AD
As a 24-bit colour#0007C3

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Neighbouring numbers

Nearby primes

Also reads as

1987 (year)

  • Common year
  • 365 days
  • 20th century
  • Rabbit

1987 was a common year of 365 days. It began on a Thursday and ended on a Thursday. Easter Sunday fell on 19 April.

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Structure of the year

Leap yearNonot divisible by 4
Days in the year365
Weeks in the year53ISO 8601 weeks; 28 December is always in the final week
Days in February28
1 January fell on aThursday
31 December fell on aThursday
Century20th century
Decade1980s
Chinese zodiacRabbit
Easter Sunday19 April

Months of 1987

January31 days, starts Thursday
February28 days, starts Sunday
March31 days, starts Sunday
April30 days, starts Wednesday
May31 days, starts Friday
June30 days, starts Monday
July31 days, starts Wednesday
August31 days, starts Saturday
September30 days, starts Tuesday
October31 days, starts Thursday
November30 days, starts Sunday
December31 days, starts Tuesday

Time references

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

Unix timestamp at the start536,457,600
Unix timestamp at the end567,993,599
Years from now39 years ago
Days from today14,496 days since 1 January

The number 1987

As a number1,987
In wordsone thousand, nine hundred and eighty-seven
Roman numeralsMCMLXXXVII

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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 “1987” by Nerdulator’s number engine. Nothing here was retrieved from a database of answers or written by a model.