Number
223
- Positive
- Odd
- Prime
- 3 digits
223 is an odd 3-digit integer and a prime number. It has 2 divisors and a digital root of 7.
Number properties
ParityOddnot divisible by 2
SignPositive
PrimalityPrime
Absolute value223
Digit count3
Digit sum7
Digital root7repeated digit sum
PalindromicNoreads differently backwards
Happy numberNosquared-digit sums reach 1
Harshad numberNodivisible by its own digit sum
Factors & divisors
Prime factorisation223
Distinct prime factors1223
Number of divisors2
Sum of divisors σ(n)224
Aliquot sum1sum of the proper divisors
ClassificationDeficientthe aliquot sum is less than the number
Euler's totient φ(n)222integers below n that share no factor with it
SquarefreeYesno repeated prime factor
All divisors1, 2232 in total
Arithmetic
Representations
Decimal223
Binary110111118 bits
Octal337
HexadecimalDF
Base 3667
Roman numeralCCXXIII
In wordstwo hundred and twenty-three
Ordinaltwo hundred and twenty-third
Scientific notation2.23 × 10^2
Engineering notation223
Nearest landmarks
Powers & multiples
223 to the power 249,729
223 to the power 311,089,567
223 to the power 42,472,973,441
223 to the power 5551,473,077,343
First ten multiples223, 446, 669, 892, 1,115, 1,338, 1,561, 1,784, 2,007, 2,230
Powers of twoBetween 2^7 (128) and 2^8 (256)
Divisibility tests
Divisible by 2No, remainder 1
Divisible by 3No, remainder 1
Divisible by 4No, remainder 3
Divisible by 5No, remainder 3
Divisible by 6No, remainder 1
Divisible by 7No, remainder 6
Divisible by 8No, remainder 7
Divisible by 9No, remainder 7
Divisible by 10No, remainder 3
Divisible by 11No, remainder 3
Divisible by 12No, remainder 7
Divisible by 100No, remainder 23
Collatz (3n + 1) trajectory
Steps to reach 170the total stopping time
Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven
First steps223 → 670 → 335 → 1,006 → 503 → 1,510 → 755 → 2,266 → 1,133 → 3,400 → …
Last steps… → 5 → 16 → 8 → 4 → 2 → 1
As a percentage & fraction
As a percentage22,300%
223% as a decimal2.23
223% of 100223
223% of 1,0002,230
As a fraction of 100223/100
Read another way
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Derived from 223
Other readings
Also reads as
#222233 (colour)
- #222233
- Blue
- Dark
- Nearest: Black
#222233 is a blue with RGB values 34, 34, 51 and HSL 240°, 20%, 17%. It is a dark colour, so white text on it reaches 15.6:1 contrast (AAA for normal text). The nearest named colour is Black.
Colour values
#222233#222233
HEX#222233
HEX (short)#223
RGBrgb(34, 34, 51)
RGB (0–1)0.1333, 0.1333, 0.2
RGB percentages13.3%, 13.3%, 20%
HSLhsl(240, 20%, 16.7%)
HSV / HSBhsv(240, 33.3%, 20%)
CMYK33.3%, 33.3%, 0%, 80%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,236,979
CSS custom property--colour: #222233;
Brightness & contrast
Relative luminance0.01723WCAG 2.x, 0 is black and 1 is white
Perceived brightness36.3 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 15.62:1
Contrast with white15.62:1WCAG normal text: AAA
Contrast with black1.34:1WCAG normal text: Fail
Greyscale equivalent#232323
Inverted#DDDDCC
Colour vision & accessibility
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text15.62:1WCAG large text: AAA
Contrast with black, large text1.34:1WCAG large text: Fail
Named colours
Hue familyblue
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#333322
Analogous#222B33, #2B2233
Triadic#332222, #223322
Split complementary#332B22, #2B3322
Tetradic#33222B, #333322, #22332B
Tints, shades & saturation
Channel breakdown
R34
G34
B51
Red34 (13.3%)
Green34 (13.3%)
Blue51 (20%)
Hue240°
Saturation (HSL)20%
Lightness16.67%
Dominant channelBlue
Hex per channelR 22 · G 22 · B 33
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Harmonies
Similar named colours
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