Number
180,000
- Positive
- Even
- Composite
- 6 digits
180,000 is an even 6-digit integer and a composite number. It has 90 divisors and a digital root of 9.
Number properties
ParityEvendivisible by 2
SignPositive
PrimalityComposite
Absolute value180,000
Digit count6
Digit sum9
Digital root9repeated digit sum
PalindromicNoreads differently backwards
Happy numberNosquared-digit sums reach 1
Harshad numberYesdivisible by its own digit sum
Factors & divisors
Prime factorisation2^5 × 3^2 × 5^4
Distinct prime factors32, 3, 5
Number of divisors90
Sum of divisors σ(n)639,639
Aliquot sum459,639sum of the proper divisors
ClassificationAbundantthe aliquot sum exceeds the number
Euler's totient φ(n)48,000integers below n that share no factor with it
SquarefreeNohas a repeated prime factor
All divisors1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 15, 16, 18, 20, 24, 25, 30, 32, 36, 40, 45, 48, 50, 60, 72, 75, 80, 90, 96, 100, 120, 125, 144, 150, 160, 180, 200, 225, 240, 250, 288, 300, 360, 375, 400, 450, 480, 500, 600, 625, 720, 750, 800, 900, 1,000, 1,125, 1,200, 1,250, 1,440, 1,500, 1,800, 1,875, 2,000, 2,250, 2,400, 2,500, 3,000, 3,600, 3,750, 4,000, 4,500, 5,000, 5,625, 6,000, 7,200, 7,500, 9,000, 10,000, 11,250, 12,000, 15,000, 18,000, 20,000, 22,500, 30,000, 36,000, 45,000, 60,000, 90,000, 180,00090 in total
Arithmetic
Representations
Decimal180,000
Binary10101111110010000018 bits
Octal537440
Hexadecimal2BF20
Base 363UW0
Roman numeralNot defined above 3,999there is no agreed standard notation
In wordsone hundred and eighty thousand
Ordinalone hundred and eighty thousandth
Scientific notation1.8 × 10^5
Engineering notation180 × 10^3
Nearest landmarks
Powers & multiples
180,000 to the power 232,400,000,000
180,000 to the power 35,832,000,000,000,000
180,000 to the power 41,049,760,000,000,000,000,000
180,000 to the power 5188,956,800,000,000,000,000,000,000
First ten multiples180,000, 360,000, 540,000, 720,000, 900,000, 1,080,000, 1,260,000, 1,440,000, 1,620,000, 1,800,000
Powers of twoBetween 2^17 (131,072) and 2^18 (262,144)
Divisibility tests
Divisible by 2Yes
Divisible by 3Yes
Divisible by 4Yes
Divisible by 5Yes
Divisible by 6Yes
Divisible by 7No, remainder 2
Divisible by 8Yes
Divisible by 9Yes
Divisible by 10Yes
Divisible by 11No, remainder 7
Divisible by 12Yes
Divisible by 100Yes
Collatz (3n + 1) trajectory
Steps to reach 1165the total stopping time
Highest value reached180,000
Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven
First steps180,000 → 90,000 → 45,000 → 22,500 → 11,250 → 5,625 → 16,876 → 8,438 → 4,219 → 12,658 → …
Last steps… → 5 → 16 → 8 → 4 → 2 → 1
As a percentage & fraction
As a percentage18,000,000%
180,000% as a decimal1,800
180,000% of 100180,000
180,000% of 1,0001,800,000
As a fraction of 100180,000/100
Read another way
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Derived from 180,000
Also reads as
#180000 (colour)
- #180000
- Red
- Dark
- Nearest: Black
#180000 is a red with RGB values 24, 0, 0 and HSL 0°, 100%, 5%. It is a dark colour, so white text on it reaches 20.2:1 contrast (AAA for normal text). The nearest named colour is Black.
Colour values
#180000#180000
HEX#180000
RGBrgb(24, 0, 0)
RGB (0–1)0.0941, 0, 0
RGB percentages9.4%, 0%, 0%
HSLhsl(0, 100%, 4.7%)
HSV / HSBhsv(0, 100%, 9.4%)
CMYK0%, 100%, 100%, 90.6%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,572,864
CSS custom property--colour: #180000;
Brightness & contrast
Relative luminance0.00194WCAG 2.x, 0 is black and 1 is white
Perceived brightness13.1 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 20.21:1
Contrast with white20.21:1WCAG normal text: AAA
Contrast with black1.04:1WCAG normal text: Fail
Greyscale equivalent#050505
Inverted#E7FFFF
Colour vision & accessibility
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text20.21:1WCAG large text: AAA
Contrast with black, large text1.04:1WCAG large text: Fail
Named colours
Hue familyred
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#001818
Analogous#18000C, #180C00
Triadic#001800, #000018
Split complementary#00180C, #000C18
Tetradic#0C1800, #001818, #0C0018
Tints, shades & saturation
Channel breakdown
R24
G0
B0
Red24 (9.4%)
Green0 (0%)
Blue0 (0%)
Hue0°
Saturation (HSL)100%
Lightness4.71%
Dominant channelRed
Hex per channelR 18 · G 00 · B 00
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