Recognised as Number
721,140
- Positive
- Even
- Composite
- 6 digits
721,140 is an even 6-digit integer and a composite number. It has 96 divisors and a digital root of 6.
Number properties
ParityEvendivisible by 2
SignPositive
PrimalityComposite
Absolute value721,140
Digit count6
Digit sum15
Digit product0zero, because one of the digits is zero
Multiplicative persistence1times 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 numberYesdivisible by its own digit sum
Factors & divisors
Prime factorisation2^2 × 3 × 5 × 7 × 17 × 101
Distinct prime factors62, 3, 5, 7, 17, 101
Number of divisors96
Sum of divisors σ(n)2,467,584
Aliquot sum1,746,444sum of the proper divisors
ClassificationAbundantthe aliquot sum exceeds the number
Euler's totient φ(n)153,600integers below n that share no factor with it
Carmichael function λ(n)1,200the smallest exponent with aˣ ≡ 1 for every unit; smaller than φ(n) = 153,600
Möbius function μ(n)0zero, because a prime divides n twice
SquarefreeNohas a repeated prime factor
All divisors1, 2, 3, 4, 5, 6, 7, 10, 12, 14, 15, 17, 20, 21, 28, 30, 34, 35, 42, 51, 60, 68, 70, 84, 85, 101, 102, 105, 119, 140, 170, 202, 204, 210, 238, 255, 303, 340, 357, 404, 420, 476, 505, 510, 595, 606, 707, 714, 1,010, 1,020, 1,190, 1,212, 1,414, 1,428, 1,515, 1,717, 1,785, 2,020, 2,121, 2,380, 2,828, 3,030, 3,434, 3,535, 3,570, 4,242, 5,151, 6,060, 6,868, 7,070, 7,140, 8,484, 8,585, 10,302, 10,605, 12,019, 14,140, 17,170, 20,604, 21,210, 24,038, 25,755, 34,340, 36,057, 42,420, 48,076, 51,510, 60,095, 72,114, 103,020, 120,190, 144,228, 180,285, 240,380, 360,570, 721,14096 in total
Arithmetic
Representations
Decimal721,140
Binary1011000000001111010020 bits
Octal2600364
HexadecimalB00F4
Base 36FGFO
Roman numeralNot defined above 3,999there is no agreed standard notation
In wordsseven hundred and twenty-one thousand, one hundred and forty
Ordinalseven hundred and twenty-one thousand, one hundred and fortieth
Scientific notation7.2114 × 10^5
Engineering notation721.14 × 10^3
In other bases
Ternary1100122012220base 3; the most digit-efficient integer base after e: 13 digits
Quinary141034030base 5; one hand: 9 digits
Septenary6062310base 7: 7 digits
Nonary1318186base 9; each digit is two ternary digits: 7 digits
Duodecimal2a93b0base 12; divides by 2, 3, 4 and 6, which is why eggs and inches come in twelves: 6 digits
Vigesimal4a2h0base 20; hands and feet, and the Mayan and Yoruba systems: 5 digits
Sexagesimal3:20:19:0base 60; Babylonian, and still how an hour and a circle are divided: 4 digits
Balanced ternary1101T0T1T00T0digits −1, 0 and +1 written T, 0 and 1; negation is swapping T and 1, so no sign is needed
Negabinary111110000000100110100base −2; place values alternate 1, −2, 4, −8, so every integer has exactly one form without a sign
Bit-level
00000000000010110000000011110100
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 even
Highest set bitbit 19worth 524,288
Lowest set bitbit 22 trailing zeros
Power of twoNo
Bytes30b 00 f4
Gray code11101000000010001110n XOR (n >> 1); successive values differ in exactly one bit
At each machine width
32-bit00000000000010110000000011110100
64-bit0000000000000000000000000000000000000000000010110000000011110100
One's complement11111111111101001111111100001011at 32 bits, every bit flipped
Bits reversed00101111000000001101000000000000at 32 bits
Rotated left by 100000000000101100000000111101000at 32 bits, wrapping
Shifted left by 1101100000000111101000= 1,442,280, no wrap
Shifted right by 11011000000001111010= 360,570, discarding the low bit
These bits as a double3.562905 × 10^-318≈IEEE-754 binary64 reinterpretation of the same 64 bits (subnormal)
Nearest landmarks
Powers & multiples
721,140 to the power 2520,042,899,600
721,140 to the power 3375,023,736,617,544,000
721,140 to the power 4270,444,617,424,375,680,160,000
721,140 to the power 5195,028,431,409,414,277,990,582,400,000
First ten multiples721,140, 1,442,280, 2,163,420, 2,884,560, 3,605,700, 4,326,840, 5,047,980, 5,769,120, 6,490,260, 7,211,400
Powers of twoBetween 2^19 (524,288) and 2^20 (1,048,576)
Divisibility tests
Divisible by 2Yes
Divisible by 3Yes
Divisible by 4Yes
Divisible by 5Yes
Divisible by 6Yes
Divisible by 7Yes
Divisible by 8No, remainder 4
Divisible by 9No, remainder 6
Divisible by 10Yes
Divisible by 11No, remainder 2
Divisible by 12Yes
Divisible by 100No, remainder 40
Collatz (3n + 1) trajectory
Steps to reach 166the total stopping time
Highest value reached721,140
Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven
First steps721,140 → 360,570 → 180,285 → 540,856 → 270,428 → 135,214 → 67,607 → 202,822 → 101,411 → 304,234 → …
Last steps… → 32 → 16 → 8 → 4 → 2 → 1
As a percentage & fraction
As a percentage72,114,000%
721,140% as a decimal7,211.4
721,140% of 100721,140
721,140% of 1,0007,211,400
As a fraction of 100721,140/100
Read another way
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Derived from 721,140
Also reads as
#721140 (colour)
- #721140
- Red
- Dark
- Nearest: Brown
#721140 is a red with RGB values 114, 17, 64 and HSL 331°, 74%, 26%. It is a dark colour, so white text on it reaches 11.2:1 contrast (AAA for normal text). The nearest named colour is Brown.
Colour values
#721140#721140
HEX#721140
RGBrgb(114, 17, 64)
RGB (0–1)0.4471, 0.0667, 0.251
RGB percentages44.7%, 6.7%, 25.1%
HSLhsl(330.9, 74%, 25.7%)
HSV / HSBhsv(330.9, 85.1%, 44.7%)
CMYK0%, 85.1%, 43.9%, 55.3%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer7,475,520
CSS custom property--colour: #721140;
Brightness & contrast
Relative luminance0.04348WCAG 2.x, 0 is black and 1 is white
Perceived brightness67.2 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 11.23:1
Contrast with white11.23:1WCAG normal text: AAA
Contrast with black1.87:1WCAG normal text: Fail
Greyscale equivalent#292929
Inverted#8DEEBF
Colour vision & accessibility
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text11.23:1WCAG large text: AAA
Contrast with black, large text1.87:1WCAG large text: Fail
Named colours
Hue familyred
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#117243
Analogous#721171, #721211
Triadic#407211, #114072
Split complementary#117212, #117172
Tetradic#717211, #117243, #121172
Tints, shades & saturation
Channel breakdown
R114
G17
B64
Red114 (44.7%)
Green17 (6.7%)
Blue64 (25.1%)
Hue330.93°
Saturation (HSL)74.05%
Lightness25.69%
Dominant channelRed
Hex per channelR 72 · G 11 · B 40
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