Number

856

Positive
Even
Composite
3 digits

856 is an even 3-digit integer and a composite number. It has 8 divisors and a digital root of 1.

The canonical address for this page is /856.

Number properties

ParityEvendivisible by 2

SignPositive

PrimalityComposite

Absolute value856

Digit count3

Digit sum19

Digital root1repeated digit sum

PalindromicNoreads differently backwards

Happy numberNosquared-digit sums reach 1

Harshad numberNodivisible by its own digit sum

Factors & divisors

Prime factorisation2^3 × 107

Distinct prime factors22, 107

Number of divisors8

Sum of divisors σ(n)1,620

Aliquot sum764sum of the proper divisors

ClassificationDeficientthe aliquot sum is less than the number

Euler's totient φ(n)424integers below n that share no factor with it

SquarefreeNohas a repeated prime factor

All divisors1, 2, 4, 8, 107, 214, 428, 8568 in total

Arithmetic

Previous number855

Next number857

Double1,712

Half428

Square732,736

Cube627,222,016

Square root29.257477677≈irrational, shown to 9 decimal places

Cube root9.494918797≈

Negation-856

Reciprocal0.0011682243≈

856 factorial2026913197407223996071742976982197809397… (2,141 digits)

Representations

Decimal856

Binary110101100010 bits

Octal1530

Hexadecimal358

Base 36NS

Roman numeralDCCCLVI

In wordseight hundred and fifty-six

Ordinaleight hundred and fifty-sixth

Scientific notation8.56 × 10^2

Engineering notation856

Nearest landmarks

Next prime857+1

Previous prime853−3

Distance to nearest prime1

Nearest square below841

Nearest square above900

Powers & multiples

856 to the power 2732,736

856 to the power 3627,222,016

856 to the power 4536,902,045,696

856 to the power 5459,588,151,115,776

First ten multiples856, 1,712, 2,568, 3,424, 4,280, 5,136, 5,992, 6,848, 7,704, 8,560

Powers of twoBetween 2^9 (512) and 2^10 (1,024)

Divisibility tests

Divisible by 2Yes

Divisible by 3No, remainder 1

Divisible by 4Yes

Divisible by 5No, remainder 1

Divisible by 6No, remainder 4

Divisible by 7No, remainder 2

Divisible by 8Yes

Divisible by 9No, remainder 1

Divisible by 10No, remainder 6

Divisible by 11No, remainder 9

Divisible by 12No, remainder 4

Divisible by 100No, remainder 56

Collatz (3n + 1) trajectory

Steps to reach 1103the total stopping time

Highest value reached9,23210× the starting value

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

First steps856 → 428 → 214 → 107 → 322 → 161 → 484 → 242 → 121 → 364 → …

Last steps… → 5 → 16 → 8 → 4 → 2 → 1

As a percentage & fraction

As a percentage85,600%

856% as a decimal8.56

856% of 100856

856% of 1,0008,560

As a fraction of 100856/100

Read another way

As seconds14 minutes and 16 seconds

As bytes856 B

As a 24-bit colour#000358

Keep nerding

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Neighbouring numbers

Derived from 856

Nearby primes

#000856 (colour)

#000856
Blue
Dark
Nearest: Midnight blue

#000856 is a blue with RGB values 0, 8, 86 and HSL 234°, 100%, 17%. It is a dark colour, so white text on it reaches 18:1 contrast (AAA for normal text). The nearest named colour is Midnight blue.

Open this reading on its own page →

Colour values

#000856#000856

HEX#000856

RGBrgb(0, 8, 86)

RGB (0–1)0, 0.0314, 0.3373

RGB percentages0%, 3.1%, 33.7%

HSLhsl(234.4, 100%, 16.9%)

HSV / HSBhsv(234.4, 100%, 33.7%)

CMYK100%, 90.7%, 0%, 66.3%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer2,134

CSS custom property--colour: #000856;

Brightness & contrast

Relative luminance0.00846WCAG 2.x, 0 is black and 1 is white

Perceived brightness29.7 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundWhitecontrast 17.96:1

Contrast with white17.96:1WCAG normal text: AAA

Contrast with black1.17:1WCAG normal text: Fail

Greyscale equivalent#0C0C0C

Inverted#FFF7A9

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#001B58no red cones; affects about 1% of men; ΔE 14.7 from the original

Deuteranopia#001255no green cones; the most common form, about 1% of men; ΔE 8.2 from the original

Tritanopia#002230no blue cones; rare, and affects men and women equally; ΔE 49.6 from the original

Distinguishable without hueYesnever rely on hue alone to carry meaning

Contrast with white, large text17.96:1WCAG large text: AAA

Contrast with black, large text1.17:1WCAG large text: Fail

Named colours

Midnight blue · ΔE 9.1 Dark slateblue · ΔE 23.9 Indigo · ΔE 25.8 Navy · ΔE 25.8 Rebecca purple · ΔE 28.1 Dark blue · ΔE 31

Nearest named CSS colourMidnight blue (#191970)ΔE 9.06, clearly different but related

Hue familyblue

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#564E00

Analogous#003356, #230056

Triadic#560008, #085600

Split complementary#562300, #335600

Tetradic#560033, #564E00, #005623

Tints, shades & saturation

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

Lighter +40%#2337FF

Lighter +30%#0016EF

Lighter +20%#0011BC

Lighter +10%#000D89

Darker −10%#000323

Darker −20%#000000

Darker −30%#000000

Darker −40%#000000

More saturated +25%#000856

Less saturated −25%#0B114B

Channel breakdown

B86

Red0 (0%)

Green8 (3.1%)

Blue86 (33.7%)

Hue234.42°

Saturation (HSL)100%

Lightness16.86%

Dominant channelBlue

Hex per channelR 00 · G 08 · B 56

Keep nerding

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856

Number properties

Factors & divisors

Arithmetic

Representations

Nearest landmarks

Powers & multiples

Divisibility tests

Collatz (3n + 1) trajectory

As a percentage & fraction

Read another way

Keep nerding

Neighbouring numbers

Derived from 856

Nearby primes

Other readings

#000856 (colour)

Colour values

Brightness & contrast

Colour vision & accessibility

Named colours

Colour harmonies

Tints, shades & saturation

Channel breakdown

Keep nerding

Harmonies

Lighter and darker

Similar named colours

Nerdulate something else