Number
400,220
- Positive
- Even
- Composite
- 6 digits
400,220 is an even 6-digit integer and a composite number. It has 12 divisors and a digital root of 8.
Number properties
ParityEvendivisible by 2
SignPositive
PrimalityComposite
Absolute value400,220
Digit count6
Digit sum8
Digital root8repeated digit sum
PalindromicNoreads differently backwards
Happy numberNosquared-digit sums reach 1
Harshad numberNodivisible by its own digit sum
Factors & divisors
Prime factorisation2^2 × 5 × 20,011
Distinct prime factors32, 5, 20,011
Number of divisors12
Sum of divisors σ(n)840,504
Aliquot sum440,284sum of the proper divisors
ClassificationAbundantthe aliquot sum exceeds the number
Euler's totient φ(n)160,080integers below n that share no factor with it
SquarefreeNohas a repeated prime factor
All divisors1, 2, 4, 5, 10, 20, 20,011, 40,022, 80,044, 100,055, 200,110, 400,22012 in total
Arithmetic
Representations
Decimal400,220
Binary110000110110101110019 bits
Octal1415534
Hexadecimal61B5C
Base 368KT8
Roman numeralNot defined above 3,999there is no agreed standard notation
In wordsfour hundred thousand, two hundred and twenty
Ordinalfour hundred thousand, two hundred and twentieth
Scientific notation4.0022 × 10^5
Engineering notation400.22 × 10^3
Nearest landmarks
Powers & multiples
400,220 to the power 2160,176,048,400
400,220 to the power 364,105,658,090,648,000
400,220 to the power 425,656,366,481,039,142,560,000
400,220 to the power 510,268,190,993,041,485,635,363,200,000
First ten multiples400,220, 800,440, 1,200,660, 1,600,880, 2,001,100, 2,401,320, 2,801,540, 3,201,760, 3,601,980, 4,002,200
Powers of twoBetween 2^18 (262,144) and 2^19 (524,288)
Divisibility tests
Divisible by 2Yes
Divisible by 3No, remainder 2
Divisible by 4Yes
Divisible by 5Yes
Divisible by 6No, remainder 2
Divisible by 7No, remainder 2
Divisible by 8No, remainder 4
Divisible by 9No, remainder 8
Divisible by 10Yes
Divisible by 11No, remainder 7
Divisible by 12No, remainder 8
Divisible by 100No, remainder 20
Collatz (3n + 1) trajectory
Steps to reach 168the total stopping time
Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven
First steps400,220 → 200,110 → 100,055 → 300,166 → 150,083 → 450,250 → 225,125 → 675,376 → 337,688 → 168,844 → …
Last steps… → 5 → 16 → 8 → 4 → 2 → 1
As a percentage & fraction
As a percentage40,022,000%
400,220% as a decimal4,002.2
400,220% of 100400,220
400,220% of 1,0004,002,200
As a fraction of 100400,220/100
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Derived from 400,220
Also reads as
#400220 (colour)
- #400220
- Red
- Dark
- Nearest: Black
#400220 is a red with RGB values 64, 2, 32 and HSL 331°, 94%, 13%. It is a dark colour, so white text on it reaches 16.8:1 contrast (AAA for normal text). The nearest named colour is Black.
Colour values
#400220#400220
HEX#400220
RGBrgb(64, 2, 32)
RGB (0–1)0.251, 0.0078, 0.1255
RGB percentages25.1%, 0.8%, 12.5%
HSLhsl(331, 93.9%, 12.9%)
HSV / HSBhsv(331, 96.9%, 25.1%)
CMYK0%, 96.9%, 50%, 74.9%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer4,194,848
CSS custom property--colour: #400220;
Brightness & contrast
Relative luminance0.01238WCAG 2.x, 0 is black and 1 is white
Perceived brightness36.7 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 16.83:1
Contrast with white16.83:1WCAG normal text: AAA
Contrast with black1.25:1WCAG normal text: Fail
Greyscale equivalent#111111
Inverted#BFFDDF
Colour vision & accessibility
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text16.83:1WCAG large text: AAA
Contrast with black, large text1.25:1WCAG large text: Fail
Named colours
Hue familyred
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#024022
Analogous#40023F, #400302
Triadic#204002, #022040
Split complementary#024003, #023F40
Tetradic#3F4002, #024022, #030240
Tints, shades & saturation
Channel breakdown
R64
G2
B32
Red64 (25.1%)
Green2 (0.8%)
Blue32 (12.5%)
Hue330.97°
Saturation (HSL)93.94%
Lightness12.94%
Dominant channelRed
Hex per channelR 40 · G 02 · B 20
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