Number
803
- Positive
- Odd
- Composite
- 3 digits
803 is an odd 3-digit integer and a composite number. It has 4 divisors and a digital root of 2.
Number properties
ParityOddnot divisible by 2
SignPositive
PrimalityComposite
Absolute value803
Digit count3
Digit sum11
Digital root2repeated digit sum
PalindromicNoreads differently backwards
Happy numberNosquared-digit sums reach 1
Harshad numberYesdivisible by its own digit sum
Factors & divisors
Prime factorisation11 × 73
Distinct prime factors211, 73
Number of divisors4
Sum of divisors σ(n)888
Aliquot sum85sum of the proper divisors
ClassificationDeficientthe aliquot sum is less than the number
Euler's totient φ(n)720integers below n that share no factor with it
SquarefreeYesno repeated prime factor
All divisors1, 11, 73, 8034 in total
Arithmetic
Representations
Decimal803
Binary110010001110 bits
Octal1443
Hexadecimal323
Base 36MB
Roman numeralDCCCIII
In wordseight hundred and three
Ordinaleight hundred and third
Scientific notation8.03 × 10^2
Engineering notation803
Nearest landmarks
Powers & multiples
803 to the power 2644,809
803 to the power 3517,781,627
803 to the power 4415,778,646,481
803 to the power 5333,870,253,124,243
First ten multiples803, 1,606, 2,409, 3,212, 4,015, 4,818, 5,621, 6,424, 7,227, 8,030
Powers of twoBetween 2^9 (512) and 2^10 (1,024)
Divisibility tests
Divisible by 2No, remainder 1
Divisible by 3No, remainder 2
Divisible by 4No, remainder 3
Divisible by 5No, remainder 3
Divisible by 6No, remainder 5
Divisible by 7No, remainder 5
Divisible by 8No, remainder 3
Divisible by 9No, remainder 2
Divisible by 10No, remainder 3
Divisible by 11Yes
Divisible by 12No, remainder 11
Divisible by 100No, remainder 3
Collatz (3n + 1) trajectory
Steps to reach 120the total stopping time
Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven
First steps803 → 2,410 → 1,205 → 3,616 → 1,808 → 904 → 452 → 226 → 113 → 340 → …
Last steps… → 32 → 16 → 8 → 4 → 2 → 1
As a percentage & fraction
As a percentage80,300%
803% as a decimal8.03
803% of 100803
803% of 1,0008,030
As a fraction of 100803/100
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Derived from 803
Other readings
Also reads as
#880033 (colour)
- #880033
- Red
- Dark
- Nearest: Brown
#880033 is a red with RGB values 136, 0, 51 and HSL 338°, 100%, 27%. It is a dark colour, so white text on it reaches 10:1 contrast (AAA for normal text). The nearest named colour is Brown.
Colour values
#880033#880033
HEX#880033
HEX (short)#803
RGBrgb(136, 0, 51)
RGB (0–1)0.5333, 0, 0.2
RGB percentages53.3%, 0%, 20%
HSLhsl(337.5, 100%, 26.7%)
HSV / HSBhsv(337.5, 100%, 53.3%)
CMYK0%, 100%, 62.5%, 46.7%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer8,912,947
CSS custom property--colour: #880033;
Brightness & contrast
Relative luminance0.05473WCAG 2.x, 0 is black and 1 is white
Perceived brightness76.3 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 10.03:1
Contrast with white10.03:1WCAG normal text: AAA
Contrast with black2.09:1WCAG normal text: Fail
Greyscale equivalent#212121
Inverted#77FFCC
Colour vision & accessibility
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text10.03:1WCAG large text: AAA
Contrast with black, large text2.09:1WCAG large text: Fail
Named colours
Hue familyred
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#008855
Analogous#880077, #881100
Triadic#338800, #003388
Split complementary#008811, #007788
Tetradic#778800, #008855, #110088
Tints, shades & saturation
Channel breakdown
R136
G0
B51
Red136 (53.3%)
Green0 (0%)
Blue51 (20%)
Hue337.5°
Saturation (HSL)100%
Lightness26.67%
Dominant channelRed
Hex per channelR 88 · G 00 · B 33
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