Number
289
- Positive
- Odd
- Composite
- Perfect square
- 3 digits
289 is an odd 3-digit integer and a composite number. It has 3 divisors and a digital root of 1.
The canonical address for this page is /289.
Number properties
ParityOddnot divisible by 2
SignPositive
PrimalityComposite
Absolute value289
Digit count3
Digit sum19
Digital root1repeated digit sum
PalindromicNoreads differently backwards
Perfect squareYes, 17²
Happy numberNosquared-digit sums reach 1
Harshad numberNodivisible by its own digit sum
Factors & divisors
Prime factorisation17^2
Distinct prime factors117
Number of divisors3
Sum of divisors σ(n)307
Aliquot sum18sum of the proper divisors
ClassificationDeficientthe aliquot sum is less than the number
Euler's totient φ(n)272integers below n that share no factor with it
SquarefreeNohas a repeated prime factor
All divisors1, 17, 2893 in total
Arithmetic
Representations
Decimal289
Binary1001000019 bits
Octal441
Hexadecimal121
Base 3681
Roman numeralCCLXXXIX
In wordstwo hundred and eighty-nine
Ordinaltwo hundred and eighty-ninth
Scientific notation2.89 × 10^2
Engineering notation289
Nearest landmarks
Powers & multiples
289 to the power 283,521
289 to the power 324,137,569
289 to the power 46,975,757,441
289 to the power 52,015,993,900,449
First ten multiples289, 578, 867, 1,156, 1,445, 1,734, 2,023, 2,312, 2,601, 2,890
Powers of twoBetween 2^8 (256) and 2^9 (512)
Divisibility tests
Divisible by 2No, remainder 1
Divisible by 3No, remainder 1
Divisible by 4No, remainder 1
Divisible by 5No, remainder 4
Divisible by 6No, remainder 1
Divisible by 7No, remainder 2
Divisible by 8No, remainder 1
Divisible by 9No, remainder 1
Divisible by 10No, remainder 9
Divisible by 11No, remainder 3
Divisible by 12No, remainder 1
Divisible by 100No, remainder 89
Collatz (3n + 1) trajectory
Steps to reach 129the total stopping time
Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven
First steps289 → 868 → 434 → 217 → 652 → 326 → 163 → 490 → 245 → 736 → …
Last steps… → 5 → 16 → 8 → 4 → 2 → 1
As a percentage & fraction
As a percentage28,900%
289% as a decimal2.89
289% of 100289
289% of 1,0002,890
As a fraction of 100289/100
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Derived from 289
Other readings
Also reads as
#000289 (colour)
- #000289
- Blue
- Dark
- Nearest: Dark blue
#000289 is a blue with RGB values 0, 2, 137 and HSL 239°, 100%, 27%. It is a dark colour, so white text on it reaches 15.3:1 contrast (AAA for normal text). The nearest named colour is Dark blue.
Colour values
#000289#000289
HEX#000289
RGBrgb(0, 2, 137)
RGB (0–1)0, 0.0078, 0.5373
RGB percentages0%, 0.8%, 53.7%
HSLhsl(239.1, 100%, 26.9%)
HSV / HSBhsv(239.1, 100%, 53.7%)
CMYK100%, 98.5%, 0%, 46.3%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer649
CSS custom property--colour: #000289;
Brightness & contrast
Relative luminance0.0185WCAG 2.x, 0 is black and 1 is white
Perceived brightness46.3 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 15.33:1
Contrast with white15.33:1WCAG normal text: AAA
Contrast with black1.37:1WCAG normal text: Fail
Greyscale equivalent#0B0B0B
Inverted#FFFD76
Colour vision & accessibility
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text15.33:1WCAG large text: AAA
Contrast with black, large text1.37:1WCAG large text: Fail
Named colours
Hue familyblue
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#898700
Analogous#004789, #420089
Triadic#890002, #028900
Split complementary#894200, #478900
Tetradic#890047, #898700, #008942
Tints, shades & saturation
Channel breakdown
R0
G2
B137
Red0 (0%)
Green2 (0.8%)
Blue137 (53.7%)
Hue239.12°
Saturation (HSL)100%
Lightness26.86%
Dominant channelBlue
Hex per channelR 00 · G 02 · B 89
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