Number
438
- Positive
- Even
- Composite
- 3 digits
438 is an even 3-digit integer and a composite number. It has 8 divisors and a digital root of 6.
Number properties
ParityEvendivisible by 2
SignPositive
PrimalityComposite
Absolute value438
Digit count3
Digit sum15
Digital root6repeated digit sum
PalindromicNoreads differently backwards
Happy numberNosquared-digit sums reach 1
Harshad numberNodivisible by its own digit sum
Factors & divisors
Prime factorisation2 × 3 × 73
Distinct prime factors32, 3, 73
Number of divisors8
Sum of divisors σ(n)888
Aliquot sum450sum of the proper divisors
ClassificationAbundantthe aliquot sum exceeds the number
Euler's totient φ(n)144integers below n that share no factor with it
SquarefreeYesno repeated prime factor
All divisors1, 2, 3, 6, 73, 146, 219, 4388 in total
Arithmetic
Representations
Decimal438
Binary1101101109 bits
Octal666
Hexadecimal1B6
Base 36C6
Roman numeralCDXXXVIII
In wordsfour hundred and thirty-eight
Ordinalfour hundred and thirty-eighth
Scientific notation4.38 × 10^2
Engineering notation438
Nearest landmarks
Powers & multiples
438 to the power 2191,844
438 to the power 384,027,672
438 to the power 436,804,120,336
438 to the power 516,120,204,707,168
First ten multiples438, 876, 1,314, 1,752, 2,190, 2,628, 3,066, 3,504, 3,942, 4,380
Powers of twoBetween 2^8 (256) and 2^9 (512)
Divisibility tests
Divisible by 2Yes
Divisible by 3Yes
Divisible by 4No, remainder 2
Divisible by 5No, remainder 3
Divisible by 6Yes
Divisible by 7No, remainder 4
Divisible by 8No, remainder 6
Divisible by 9No, remainder 6
Divisible by 10No, remainder 8
Divisible by 11No, remainder 9
Divisible by 12No, remainder 6
Divisible by 100No, remainder 38
Collatz (3n + 1) trajectory
Steps to reach 153the total stopping time
Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven
First steps438 → 219 → 658 → 329 → 988 → 494 → 247 → 742 → 371 → 1,114 → …
Last steps… → 5 → 16 → 8 → 4 → 2 → 1
As a percentage & fraction
As a percentage43,800%
438% as a decimal4.38
438% of 100438
438% of 1,0004,380
As a fraction of 100438/100
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Derived from 438
Other readings
Also reads as
#443388 (colour)
- #443388
- Blue
- Dark
- Nearest: Dark slateblue
#443388 is a blue with RGB values 68, 51, 136 and HSL 252°, 45%, 37%. It is a dark colour, so white text on it reaches 10.1:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.
Colour values
#443388#443388
HEX#443388
HEX (short)#438
RGBrgb(68, 51, 136)
RGB (0–1)0.2667, 0.2, 0.5333
RGB percentages26.7%, 20%, 53.3%
HSLhsl(252, 45.5%, 36.7%)
HSV / HSBhsv(252, 62.5%, 53.3%)
CMYK50%, 62.5%, 0%, 46.7%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer4,469,640
CSS custom property--colour: #443388;
Brightness & contrast
Relative luminance0.05374WCAG 2.x, 0 is black and 1 is white
Perceived brightness70.8 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 10.12:1
Contrast with white10.12:1WCAG normal text: AAA
Contrast with black2.07:1WCAG normal text: Fail
Greyscale equivalent#3D3D3D
Inverted#BBCC77
Colour vision & accessibility
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text10.12:1WCAG large text: AAA
Contrast with black, large text2.07:1WCAG large text: Fail
Named colours
Hue familyblue
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#778833
Analogous#334D88, #6F3388
Triadic#884433, #338844
Split complementary#886F33, #4D8833
Tetradic#88334D, #778833, #33886F
Tints, shades & saturation
Channel breakdown
R68
G51
B136
Red68 (26.7%)
Green51 (20%)
Blue136 (53.3%)
Hue252°
Saturation (HSL)45.45%
Lightness36.67%
Dominant channelBlue
Hex per channelR 44 · G 33 · B 88
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Harmonies
Similar named colours
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