Recognised as Number
722,121
- Positive
- Odd
- Composite
- 6 digits
722,121 is an odd 6-digit integer and a composite number. It has 4 divisors and a digital root of 6.
Number properties
ParityOddnot divisible by 2
SignPositive
PrimalityComposite
Absolute value722,121
Digit count6
Digit sum15
Digit product56
Multiplicative persistence3times the digit product can be taken before one digit is left
Digital root6repeated digit sum
PalindromicNoreads differently backwards
Happy numberNosquared-digit sums reach 1
Harshad numberNodivisible by its own digit sum
Factors & divisors
Prime factorisation3 × 240,707
Distinct prime factors23, 240,707
Number of divisors4
Sum of divisors σ(n)962,832
Aliquot sum240,711sum of the proper divisors
ClassificationDeficientthe aliquot sum is less than the number
Euler's totient φ(n)481,412integers below n that share no factor with it
Carmichael function λ(n)240,706the smallest exponent with aˣ ≡ 1 for every unit; smaller than φ(n) = 481,412
Möbius function μ(n)+12 distinct prime factors, an even number of them
SquarefreeYesno repeated prime factor
All divisors1, 3, 240,707, 722,1214 in total
Arithmetic
Representations
Decimal722,121
Binary1011000001001100100120 bits
Octal2602311
HexadecimalB04C9
Base 36FH6X
Roman numeralNot defined above 3,999there is no agreed standard notation
In wordsseven hundred and twenty-two thousand, one hundred and twenty-one
Ordinalseven hundred and twenty-two thousand, one hundred and twenty-first
Scientific notation7.22121 × 10^5
Engineering notation722.121 × 10^3
In other bases
Ternary1100200120020base 3; the most digit-efficient integer base after e: 13 digits
Quinary141101441base 5; one hand: 9 digits
Septenary6065211base 7: 7 digits
Nonary1320506base 9; each digit is two ternary digits: 7 digits
Duodecimal2a9a89base 12; divides by 2, 3, 4 and 6, which is why eggs and inches come in twelves: 6 digits
Vigesimal4a561base 20; hands and feet, and the Mayan and Yoruba systems: 5 digits
Sexagesimal3:20:35:21base 60; Babylonian, and still how an hour and a circle are divided: 4 digits
Balanced ternary1101T01TT01T0digits −1, 0 and +1 written T, 0 and 1; negation is swapping T and 1, so no sign is needed
Negabinary111110000010111011001base −2; place values alternate 1, −2, 4, −8, so every integer has exactly one form without a sign
Bit-level
00000000000010110000010011001001
Bit length20 bitsto write the magnitude
Set bits8the population count, or Hamming weight
Zero bits12within that length
Bit parityeven8 set bits, so even; not the same as the number itself being odd
Highest set bitbit 19worth 524,288
Lowest set bitbit 00 trailing zeros
Power of twoNo
Bytes30b 04 c9
Gray code11101000011010101101n XOR (n >> 1); successive values differ in exactly one bit
At each machine width
32-bit00000000000010110000010011001001
64-bit0000000000000000000000000000000000000000000010110000010011001001
One's complement11111111111101001111101100110110at 32 bits, every bit flipped
Bits reversed10010011001000001101000000000000at 32 bits
Rotated left by 100000000000101100000100110010010at 32 bits, wrapping
Shifted left by 1101100000100110010010= 1,444,242, no wrap
Shifted right by 11011000001001100100= 361,060, discarding the low bit
These bits as a double3.56775178 × 10^-318≈IEEE-754 binary64 reinterpretation of the same 64 bits (subnormal)
Nearest landmarks
Powers & multiples
722,121 to the power 2521,458,738,641
722,121 to the power 3376,556,305,806,177,561
722,121 to the power 4271,919,216,105,062,746,526,881
722,121 to the power 5196,358,576,253,004,015,584,737,834,601
First ten multiples722,121, 1,444,242, 2,166,363, 2,888,484, 3,610,605, 4,332,726, 5,054,847, 5,776,968, 6,499,089, 7,221,210
Powers of twoBetween 2^19 (524,288) and 2^20 (1,048,576)
Divisibility tests
Divisible by 2No, remainder 1
Divisible by 3Yes
Divisible by 4No, remainder 1
Divisible by 5No, remainder 1
Divisible by 6No, remainder 3
Divisible by 7No, remainder 1
Divisible by 8No, remainder 1
Divisible by 9No, remainder 6
Divisible by 10No, remainder 1
Divisible by 11No, remainder 4
Divisible by 12No, remainder 9
Divisible by 100No, remainder 21
Collatz (3n + 1) trajectory
Steps to reach 166the total stopping time
Highest value reached3,655,7445× the starting value
Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven
First steps722,121 → 2,166,364 → 1,083,182 → 541,591 → 1,624,774 → 812,387 → 2,437,162 → 1,218,581 → 3,655,744 → 1,827,872 → …
Last steps… → 32 → 16 → 8 → 4 → 2 → 1
As a percentage & fraction
As a percentage72,212,100%
722,121% as a decimal7,221.21
722,121% of 100722,121
722,121% of 1,0007,221,210
As a fraction of 100722,121/100
Read another way
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Derived from 722,121
Also reads as
#722121 (colour)
- #722121
- Red
- Dark
- Nearest: Brown
#722121 is a red with RGB values 114, 33, 33 and HSL 0°, 55%, 29%. It is a dark colour, so white text on it reaches 10.7:1 contrast (AAA for normal text). The nearest named colour is Brown.
Colour values
#722121#722121
HEX#722121
RGBrgb(114, 33, 33)
RGB (0–1)0.4471, 0.1294, 0.1294
RGB percentages44.7%, 12.9%, 12.9%
HSLhsl(0, 55.1%, 28.8%)
HSV / HSBhsv(0, 71.1%, 44.7%)
CMYK0%, 71.1%, 71.1%, 55.3%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer7,479,585
CSS custom property--colour: #722121;
Brightness & contrast
Relative luminance0.04775WCAG 2.x, 0 is black and 1 is white
Perceived brightness68.2 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 10.74:1
Contrast with white10.74:1WCAG normal text: AAA
Contrast with black1.95:1WCAG normal text: Fail
Greyscale equivalent#323232
Inverted#8DDEDE
Colour vision & accessibility
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text10.74:1WCAG large text: AAA
Contrast with black, large text1.95:1WCAG large text: Fail
Named colours
Hue familyred
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#217272
Analogous#72214A, #724A21
Triadic#217221, #212172
Split complementary#21724A, #214A72
Tetradic#4A7221, #217272, #4A2172
Tints, shades & saturation
Channel breakdown
R114
G33
B33
Red114 (44.7%)
Green33 (12.9%)
Blue33 (12.9%)
Hue0°
Saturation (HSL)55.1%
Lightness28.82%
Dominant channelRed
Hex per channelR 72 · G 21 · B 21
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