Number
188
- Positive
- Even
- Composite
- 3 digits
188 is an even 3-digit integer and a composite number. It has 6 divisors and a digital root of 8.
Number properties
ParityEvendivisible by 2
SignPositive
PrimalityComposite
Absolute value188
Digit count3
Digit sum17
Digital root8repeated digit sum
PalindromicNoreads differently backwards
Happy numberYessquared-digit sums reach 1
Harshad numberNodivisible by its own digit sum
Factors & divisors
Prime factorisation2^2 × 47
Distinct prime factors22, 47
Number of divisors6
Sum of divisors σ(n)336
Aliquot sum148sum of the proper divisors
ClassificationDeficientthe aliquot sum is less than the number
Euler's totient φ(n)92integers below n that share no factor with it
SquarefreeNohas a repeated prime factor
All divisors1, 2, 4, 47, 94, 1886 in total
Arithmetic
Representations
Decimal188
Binary101111008 bits
Octal274
HexadecimalBC
Base 3658
Roman numeralCLXXXVIII
In wordsone hundred and eighty-eight
Ordinalone hundred and eighty-eighth
Scientific notation1.88 × 10^2
Engineering notation188
Nearest landmarks
Powers & multiples
188 to the power 235,344
188 to the power 36,644,672
188 to the power 41,249,198,336
188 to the power 5234,849,287,168
First ten multiples188, 376, 564, 752, 940, 1,128, 1,316, 1,504, 1,692, 1,880
Powers of twoBetween 2^7 (128) and 2^8 (256)
Divisibility tests
Divisible by 2Yes
Divisible by 3No, remainder 2
Divisible by 4Yes
Divisible by 5No, remainder 3
Divisible by 6No, remainder 2
Divisible by 7No, remainder 6
Divisible by 8No, remainder 4
Divisible by 9No, remainder 8
Divisible by 10No, remainder 8
Divisible by 11No, remainder 1
Divisible by 12No, remainder 8
Divisible by 100No, remainder 88
Collatz (3n + 1) trajectory
Steps to reach 1106the total stopping time
Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven
First steps188 → 94 → 47 → 142 → 71 → 214 → 107 → 322 → 161 → 484 → …
Last steps… → 5 → 16 → 8 → 4 → 2 → 1
As a percentage & fraction
As a percentage18,800%
188% as a decimal1.88
188% of 100188
188% of 1,0001,880
As a fraction of 100188/100
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Derived from 188
Other readings
Also reads as
#118888 (colour)
- #118888
- Cyan
- Dark
- Nearest: Dark cyan
#118888 is a cyan with RGB values 17, 136, 136 and HSL 180°, 78%, 30%. It is a dark colour, so black text on it reaches 4.9:1 contrast (AA for normal text). The nearest named colour is Dark cyan.
Colour values
#118888#118888
HEX#118888
HEX (short)#188
RGBrgb(17, 136, 136)
RGB (0–1)0.0667, 0.5333, 0.5333
RGB percentages6.7%, 53.3%, 53.3%
HSLhsl(180, 77.8%, 30%)
HSV / HSBhsv(180, 87.5%, 53.3%)
CMYK87.5%, 0%, 0%, 46.7%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,149,064
CSS custom property--colour: #118888;
Brightness & contrast
Relative luminance0.19505WCAG 2.x, 0 is black and 1 is white
Perceived brightness114.2 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 4.9:1
Contrast with white4.28:1WCAG normal text: Fail
Contrast with black4.9:1WCAG normal text: AA
Greyscale equivalent#6F6F6F
Inverted#EE7777
Colour vision & accessibility
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text4.28:1WCAG large text: AA
Contrast with black, large text4.9:1WCAG large text: AAA
Named colours
Hue familycyan
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#881111
Analogous#11884D, #114D88
Triadic#881188, #888811
Split complementary#88114D, #884D11
Tetradic#4D1188, #881111, #4D8811
Tints, shades & saturation
Channel breakdown
R17
G136
B136
Red17 (6.7%)
Green136 (53.3%)
Blue136 (53.3%)
Hue180°
Saturation (HSL)77.78%
Lightness30%
Dominant channelGreen and Blue
Hex per channelR 11 · G 88 · B 88
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