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Number

789

Positive
Odd
Composite
3 digits

789 is an odd 3-digit integer and a composite number. It has 4 divisors and a digital root of 6.

Number properties

ParityOddnot divisible by 2

SignPositive

PrimalityComposite

Absolute value789

Digit count3

Digit sum24

Digital root6repeated digit sum

PalindromicNoreads differently backwards

Happy numberNosquared-digit sums reach 1

Harshad numberNodivisible by its own digit sum

Factors & divisors

Prime factorisation3 × 263

Distinct prime factors23, 263

Number of divisors4

Sum of divisors σ(n)1,056

Aliquot sum267sum of the proper divisors

ClassificationDeficientthe aliquot sum is less than the number

Euler's totient φ(n)524integers below n that share no factor with it

SquarefreeYesno repeated prime factor

All divisors1, 3, 263, 7894 in total

Arithmetic

Previous number788

Next number790

Double1,578

Cube491,169,069

Square root28.08914381≈irrational, shown to 9 decimal places

Cube root9.240433255≈

Negation-789

Reciprocal0.0012674271≈

789 factorial9617974384062335467636723938025836267680… (1,945 digits)

Representations

Decimal789

Binary110001010110 bits

Octal1425

Hexadecimal315

Base 36LX

Roman numeralDCCLXXXIX

In wordsseven hundred and eighty-nine

Ordinalseven hundred and eighty-ninth

Scientific notation7.89 × 10^2

Engineering notation789

Nearest landmarks

Next prime797+8

Previous prime787−2

Distance to nearest prime2

Nearest square below784

Nearest square above841

Powers & multiples

789 to the power 2622,521

789 to the power 3491,169,069

789 to the power 4387,532,395,441

789 to the power 5305,763,060,002,949

First ten multiples789, 1,578, 2,367, 3,156, 3,945, 4,734, 5,523, 6,312, 7,101, 7,890

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

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 5

Divisible by 8No, remainder 5

Divisible by 9No, remainder 6

Divisible by 10No, remainder 9

Divisible by 11No, remainder 8

Divisible by 12No, remainder 9

Divisible by 100No, remainder 89

Collatz (3n + 1) trajectory

Steps to reach 128the total stopping time

Highest value reached2,3683× the starting value

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

First steps789 → 2,368 → 1,184 → 592 → 296 → 148 → 74 → 37 → 112 → 56 → …

Last steps… → 5 → 16 → 8 → 4 → 2 → 1

As a percentage & fraction

As a percentage78,900%

789% as a decimal7.89

789% of 100789

789% of 1,0007,890

As a fraction of 100789/100

Read another way

As seconds13 minutes and 9 seconds

As bytes789 B

As a 24-bit colour#000315

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Neighbouring numbers

Derived from 789

Nearby primes

Other readings

Also reads as

#778899 (colour)

#778899
Blue
Dark
Named: Light slate grey

#778899 is the CSS colour blue with RGB values 119, 136, 153 and HSL 210°, 14%, 53%. It is a dark colour, so black text on it reaches 5.8:1 contrast (AA for normal text). The nearest named colour is Light slate grey.

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Colour values

#778899#778899

HEX#778899

HEX (short)#789

RGBrgb(119, 136, 153)

RGB (0–1)0.4667, 0.5333, 0.6

RGB percentages46.7%, 53.3%, 60%

HSLhsl(210, 14.3%, 53.3%)

HSV / HSBhsv(210, 22.2%, 60%)

CMYK22.2%, 11.1%, 0%, 40%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer7,833,753

CSS custom property--colour: #778899;

Brightness & contrast

Relative luminance0.2383WCAG 2.x, 0 is black and 1 is white

Perceived brightness133.3 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundBlackcontrast 5.77:1

Contrast with white3.64:1WCAG normal text: Fail

Contrast with black5.77:1WCAG normal text: AA

Greyscale equivalent#868686

Inverted#887766

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#82889Ano red cones; affects about 1% of men; ΔE 4.1 from the original

Deuteranopia#7E8499no green cones; the most common form, about 1% of men; ΔE 4.7 from the original

Tritanopia#6E8C8Dno blue cones; rare, and affects men and women equally; ΔE 10.7 from the original

Distinguishable without hueYesnever rely on hue alone to carry meaning

Contrast with white, large text3.64:1WCAG large text: AA

Contrast with black, large text5.77:1WCAG large text: AAA

Named colours

Light slate grey · ΔE 0 Slate grey · ΔE 3.1 Gray · ΔE 11.6 Dim grey · ΔE 16.1 Dark grey · ΔE 17.5 Cadetblue · ΔE 18.6

This is a named CSS colourLight slate grey (#778899)exact match

Hue familyblue

CSS keyword usablelightslategray

Colour harmonies

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

Complementary#998877

Analogous#779999, #777799

Triadic#997788, #889977

Split complementary#997777, #999977

Tetradic#997799, #998877, #779977

Tints, shades & saturation

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

Lighter +40%#ECEEF0

Lighter +30%#CED5DB

Lighter +20%#B1BBC5

Lighter +10%#94A2AF

Darker −10%#5F6F7E

Darker −20%#495561

Darker −30%#333C44

Darker −40%#1D2227

More saturated +25%#5988B7

Less saturated −25%#888888

Channel breakdown

R119

G136

B153

Red119 (46.7%)

Green136 (53.3%)

Blue153 (60%)

Hue210°

Saturation (HSL)14.29%

Lightness53.33%

Dominant channelBlue

Hex per channelR 77 · G 88 · B 99

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Harmonies

Lighter and darker

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