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Recognised as Number

387,721

  • Positive
  • Odd
  • Prime
  • 6 digits

387,721 is an odd 6-digit integer and a prime number. It has 2 divisors and a digital root of 1.

Number properties

ParityOddnot divisible by 2
SignPositive
PrimalityPrime
Absolute value387,721
Digit count6
Digit sum28
Digit product2,352
Multiplicative persistence3times the digit product can be taken before one digit is left
Digital root1repeated digit sum
PalindromicNoreads differently backwards
Happy numberYessquared-digit sums reach 1
Harshad numberNodivisible by its own digit sum

Factors & divisors

Prime factorisation387,721
Distinct prime factors1387,721
Number of divisors2
Sum of divisors σ(n)387,722
Aliquot sum1sum of the proper divisors
ClassificationDeficientthe aliquot sum is less than the number
Euler's totient φ(n)387,720integers below n that share no factor with it
Carmichael function λ(n)387,720the smallest exponent with aˣ ≡ 1 for every unit coprime to n
Möbius function μ(n)−11 distinct prime factor, an odd number of them
SquarefreeYesno repeated prime factor
All divisors1, 387,7212 in total

Arithmetic

Previous number387,720
Next number387,722
Double775,442
Half193,860.5
Square150,327,573,841
Cube58,285,157,257,206,361
Square root622.672466069≈irrational, shown to 9 decimal places
Cube root72.918843944≈
Negation-387,721
Reciprocal0.0000025792≈

Representations

Decimal387,721
Binary101111010101000100119 bits
Octal1365211
Hexadecimal5EA89
Base 368B61
Roman numeralNot defined above 3,999there is no agreed standard notation
In wordsthree hundred and eighty-seven thousand, seven hundred and twenty-one
Ordinalthree hundred and eighty-seven thousand, seven hundred and twenty-first
Scientific notation3.87721 × 10^5
Engineering notation387.721 × 10^3

In other bases

Ternary201200212001base 3; the most digit-efficient integer base after e: 12 digits
Quinary44401341base 5; one hand: 8 digits
Septenary3203245base 7: 7 digits
Nonary650761base 9; each digit is two ternary digits: 6 digits
Duodecimal168461base 12; divides by 2, 3, 4 and 6, which is why eggs and inches come in twelves: 6 digits
Vigesimal28961base 20; hands and feet, and the Mayan and Yoruba systems: 5 digits
Sexagesimal1:47:42:1base 60; Babylonian, and still how an hour and a circle are divided: 4 digits
Balanced ternary1T1TT010TT001digits −1, 0 and +1 written T, 0 and 1; negation is swapping T and 1, so no sign is needed
Negabinary110100011111110011001base −2; place values alternate 1, −2, 4, −8, so every integer has exactly one form without a sign

Bit-level

00000000000001011110101010001001
Bit length19 bitsto write the magnitude
Set bits10the population count, or Hamming weight
Zero bits9within that length
Bit parityeven10 set bits, so even; not the same as the number itself being odd
Highest set bitbit 18worth 262,144
Lowest set bitbit 00 trailing zeros
Power of twoNo
Bytes305 ea 89
Gray code1110001111111001101n XOR (n >> 1); successive values differ in exactly one bit

At each machine width

32-bit00000000000001011110101010001001
64-bit0000000000000000000000000000000000000000000001011110101010001001
One's complement11111111111110100001010101110110at 32 bits, every bit flipped
Bits reversed10010001010101111010000000000000at 32 bits
Rotated left by 100000000000010111101010100010010at 32 bits, wrapping
Shifted left by 110111101010100010010= 775,442, no wrap
Shifted right by 1101111010101000100= 193,860, discarding the low bit
These bits as a double1.91559626 × 10^-318≈IEEE-754 binary64 reinterpretation of the same 64 bits (subnormal)

Nearest landmarks

Next prime387,727+6
Previous prime387,707−14
Distance to nearest prime0, it is prime
Nearest square below386,884
Nearest square above388,129

Powers & multiples

387,721 to the power 2150,327,573,841
387,721 to the power 358,285,157,257,206,361
387,721 to the power 422,598,379,456,921,307,493,281
387,721 to the power 58,761,866,281,416,986,262,602,402,601
First ten multiples387,721, 775,442, 1,163,163, 1,550,884, 1,938,605, 2,326,326, 2,714,047, 3,101,768, 3,489,489, 3,877,210
Powers of twoBetween 2^18 (262,144) and 2^19 (524,288)

Divisibility tests

Divisible by 2No, remainder 1
Divisible by 3No, remainder 1
Divisible by 4No, remainder 1
Divisible by 5No, remainder 1
Divisible by 6No, remainder 1
Divisible by 7No, remainder 5
Divisible by 8No, remainder 1
Divisible by 9No, remainder 1
Divisible by 10No, remainder 1
Divisible by 11No, remainder 4
Divisible by 12No, remainder 1
Divisible by 100No, remainder 21

Collatz (3n + 1) trajectory

Steps to reach 1161the total stopping time
Highest value reached3,312,3048× the starting value
Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven
First steps387,721 → 1,163,164 → 581,582 → 290,791 → 872,374 → 436,187 → 1,308,562 → 654,281 → 1,962,844 → 981,422 → …
Last steps… → 5 → 16 → 8 → 4 → 2 → 1

As a percentage & fraction

As a percentage38,772,100%
387,721% as a decimal3,877.21
387,721% of 100387,721
387,721% of 1,0003,877,210
As a fraction of 100387,721/100

Read another way

As seconds4 days, 11 hours and 42 minutes
As bytes378.634 KiB
As a 24-bit colour#05EA89

Keep nerding

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Neighbouring numbers

Nearby primes

Also reads as

#387721 (colour)

  • #387721
  • Green
  • Dark
  • Nearest: Dark green

#387721 is a green with RGB values 56, 119, 33 and HSL 104°, 57%, 30%. It is a dark colour, so white text on it reaches 5.5:1 contrast (AA for normal text). The nearest named colour is Dark green.

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Colour values

#387721#387721
HEX#387721
RGBrgb(56, 119, 33)
RGB (0–1)0.2196, 0.4667, 0.1294
RGB percentages22%, 46.7%, 12.9%
HSLhsl(104, 56.6%, 29.8%)
HSV / HSBhsv(104, 72.3%, 46.7%)
CMYK52.9%, 0%, 72.3%, 53.3%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer3,700,513
CSS custom property--colour: #387721;

Brightness & contrast

Relative luminance0.14144WCAG 2.x, 0 is black and 1 is white
Perceived brightness96.8 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 5.48:1
Contrast with white5.48:1WCAG normal text: AA
Contrast with black3.83:1WCAG normal text: Fail
Greyscale equivalent#636363
Inverted#C788DE

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#7B6C14no red cones; affects about 1% of men; ΔE 34.1 from the original
Deuteranopia#726729no green cones; the most common form, about 1% of men; ΔE 33.2 from the original
Tritanopia#337366no blue cones; rare, and affects men and women equally; ΔE 40.5 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text5.48:1WCAG large text: AAA
Contrast with black, large text3.83:1WCAG large text: AA

Named colours

Dark green · ΔE 10.8Forest green · ΔE 15.2Olivedrab · ΔE 17Green · ΔE 18.3Dark olivegreen · ΔE 20.2Sea green · ΔE 20.7
Nearest named CSS colourDark green (#006400)ΔE 10.78, a distinctly different colour
Hue familygreen
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#602177
Analogous#637721, #217735
Triadic#213877, #772138
Split complementary#352177, #772163
Tetradic#216377, #602177, #773521

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#9EDE86
Lighter +30%#7ED25F
Lighter +20%#5EC737
Lighter +10%#4B9F2C
Darker −10%#254F16
Darker −20%#12270B
Darker −30%#000000
Darker −40%#000000
More saturated +25%#2F8A0E
Less saturated −25%#416434

Channel breakdown

R56
G119
B33
Red56 (22%)
Green119 (46.7%)
Blue33 (12.9%)
Hue103.95°
Saturation (HSL)56.58%
Lightness29.8%
Dominant channelGreen
Hex per channelR 38 · G 77 · B 21

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Every value on this page was computed from “387721” by Nerdulator’s number engine. Nothing here was retrieved from a database of answers or written by a model.