Number
239
- Positive
- Odd
- Prime
- 3 digits
239 is an odd 3-digit integer and a prime number. It has 2 divisors and a digital root of 5.
Number properties
ParityOddnot divisible by 2
SignPositive
PrimalityPrime
Absolute value239
Digit count3
Digit sum14
Digital root5repeated digit sum
PalindromicNoreads differently backwards
Happy numberYessquared-digit sums reach 1
Harshad numberNodivisible by its own digit sum
Factors & divisors
Prime factorisation239
Distinct prime factors1239
Number of divisors2
Sum of divisors σ(n)240
Aliquot sum1sum of the proper divisors
ClassificationDeficientthe aliquot sum is less than the number
Euler's totient φ(n)238integers below n that share no factor with it
SquarefreeYesno repeated prime factor
All divisors1, 2392 in total
Arithmetic
Representations
Decimal239
Binary111011118 bits
Octal357
HexadecimalEF
Base 366N
Roman numeralCCXXXIX
In wordstwo hundred and thirty-nine
Ordinaltwo hundred and thirty-ninth
Scientific notation2.39 × 10^2
Engineering notation239
Nearest landmarks
Powers & multiples
239 to the power 257,121
239 to the power 313,651,919
239 to the power 43,262,808,641
239 to the power 5779,811,265,199
First ten multiples239, 478, 717, 956, 1,195, 1,434, 1,673, 1,912, 2,151, 2,390
Powers of twoBetween 2^7 (128) and 2^8 (256)
Divisibility tests
Divisible by 2No, remainder 1
Divisible by 3No, remainder 2
Divisible by 4No, remainder 3
Divisible by 5No, remainder 4
Divisible by 6No, remainder 5
Divisible by 7No, remainder 1
Divisible by 8No, remainder 7
Divisible by 9No, remainder 5
Divisible by 10No, remainder 9
Divisible by 11No, remainder 8
Divisible by 12No, remainder 11
Divisible by 100No, remainder 39
Collatz (3n + 1) trajectory
Steps to reach 152the total stopping time
Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven
First steps239 → 718 → 359 → 1,078 → 539 → 1,618 → 809 → 2,428 → 1,214 → 607 → …
Last steps… → 5 → 16 → 8 → 4 → 2 → 1
As a percentage & fraction
As a percentage23,900%
239% as a decimal2.39
239% of 100239
239% of 1,0002,390
As a fraction of 100239/100
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Derived from 239
Other readings
Also reads as
#223399 (colour)
- #223399
- Blue
- Dark
- Nearest: Midnight blue
#223399 is a blue with RGB values 34, 51, 153 and HSL 231°, 64%, 37%. It is a dark colour, so white text on it reaches 10.5:1 contrast (AAA for normal text). The nearest named colour is Midnight blue.
Colour values
#223399#223399
HEX#223399
HEX (short)#239
RGBrgb(34, 51, 153)
RGB (0–1)0.1333, 0.2, 0.6
RGB percentages13.3%, 20%, 60%
HSLhsl(231.4, 63.6%, 36.7%)
HSV / HSBhsv(231.4, 77.8%, 60%)
CMYK77.8%, 66.7%, 0%, 40%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,241,433
CSS custom property--colour: #223399;
Brightness & contrast
Relative luminance0.05008WCAG 2.x, 0 is black and 1 is white
Perceived brightness67.4 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 10.49:1
Contrast with white10.49:1WCAG normal text: AAA
Contrast with black2:1WCAG normal text: Fail
Greyscale equivalent#373737
Inverted#DDCC66
Colour vision & accessibility
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text10.49:1WCAG large text: AAA
Contrast with black, large text2:1WCAG large text: Fail
Named colours
Hue familyblue
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#998822
Analogous#226E99, #4D2299
Triadic#992233, #339922
Split complementary#994D22, #6E9922
Tetradic#99226E, #998822, #22994D
Tints, shades & saturation
Channel breakdown
R34
G51
B153
Red34 (13.3%)
Green51 (20%)
Blue153 (60%)
Hue231.43°
Saturation (HSL)63.64%
Lightness36.67%
Dominant channelBlue
Hex per channelR 22 · G 33 · B 99
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Harmonies
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