Recognised as Number
380
- Positive
- Even
- Composite
- 3 digits
380 is an even 3-digit integer and a composite number. It has 12 divisors and a digital root of 2.
Number properties
ParityEvendivisible by 2
SignPositive
PrimalityComposite
Absolute value380
Digit count3
Digit sum11
Digit product0zero, because one of the digits is zero
Multiplicative persistence1times the digit product can be taken before one digit is left
Digital root2repeated digit sum
PalindromicNoreads differently backwards
Happy numberNosquared-digit sums reach 1
Harshad numberNodivisible by its own digit sum
Factors & divisors
Prime factorisation2^2 × 5 × 19
Distinct prime factors32, 5, 19
Number of divisors12
Sum of divisors σ(n)840
Aliquot sum460sum of the proper divisors
ClassificationAbundantthe aliquot sum exceeds the number
Euler's totient φ(n)144integers below n that share no factor with it
Carmichael function λ(n)36the smallest exponent with aˣ ≡ 1 for every unit; smaller than φ(n) = 144
Möbius function μ(n)0zero, because a prime divides n twice
SquarefreeNohas a repeated prime factor
All divisors1, 2, 4, 5, 10, 19, 20, 38, 76, 95, 190, 38012 in total
Arithmetic
Representations
Decimal380
Binary1011111009 bits
Octal574
Hexadecimal17C
Base 36AK
Roman numeralCCCLXXX
In wordsthree hundred and eighty
Ordinalthree hundred and eightieth
Scientific notation3.8 × 10^2
Engineering notation380
In other bases
Ternary112002base 3; the most digit-efficient integer base after e: 6 digits
Quinary3010base 5; one hand: 4 digits
Septenary1052base 7: 4 digits
Nonary462base 9; each digit is two ternary digits: 3 digits
Duodecimal278base 12; divides by 2, 3, 4 and 6, which is why eggs and inches come in twelves: 3 digits
Vigesimalj0base 20; hands and feet, and the Mayan and Yoruba systems: 2 digits
Sexagesimal6:20base 60; Babylonian, and still how an hour and a circle are divided: 2 digits
Balanced ternary1TTT01Tdigits −1, 0 and +1 written T, 0 and 1; negation is swapping T and 1, so no sign is needed
Negabinary11010001100base −2; place values alternate 1, −2, 4, −8, so every integer has exactly one form without a sign
Bit-level
0000000101111100
Bit length9 bitsto write the magnitude
Set bits6the population count, or Hamming weight
Zero bits3within that length
Bit parityeven6 set bits, so even; not the same as the number itself being even
Highest set bitbit 8worth 256
Lowest set bitbit 22 trailing zeros
Power of twoNo
Bytes201 7c
Gray code111000010n XOR (n >> 1); successive values differ in exactly one bit
At each machine width
16-bit0000000101111100
32-bit00000000000000000000000101111100
64-bit0000000000000000000000000000000000000000000000000000000101111100
One's complement1111111010000011at 16 bits, every bit flipped
Bits reversed0011111010000000at 16 bits
Rotated left by 10000001011111000at 16 bits, wrapping
Shifted left by 11011111000= 760, no wrap
Shifted right by 110111110= 190, discarding the low bit
These bits as a double1.87744945 × 10^-321≈IEEE-754 binary64 reinterpretation of the same 64 bits (subnormal)
Nearest landmarks
Powers & multiples
380 to the power 2144,400
380 to the power 354,872,000
380 to the power 420,851,360,000
380 to the power 57,923,516,800,000
First ten multiples380, 760, 1,140, 1,520, 1,900, 2,280, 2,660, 3,040, 3,420, 3,800
Powers of twoBetween 2^8 (256) and 2^9 (512)
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 2
Divisible by 10Yes
Divisible by 11No, remainder 6
Divisible by 12No, remainder 8
Divisible by 100No, remainder 80
Collatz (3n + 1) trajectory
Steps to reach 1107the total stopping time
Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven
First steps380 → 190 → 95 → 286 → 143 → 430 → 215 → 646 → 323 → 970 → …
Last steps… → 5 → 16 → 8 → 4 → 2 → 1
As a percentage & fraction
As a percentage38,000%
380% as a decimal3.8
380% of 100380
380% of 1,0003,800
As a fraction of 100380/100
Read another way
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Derived from 380
Other readings
Also reads as
#338800 (colour)
- #338800
- Green
- Dark
- Nearest: Green
#338800 is a green with RGB values 51, 136, 0 and HSL 98°, 100%, 27%. It is a dark colour, so black text on it reaches 4.7:1 contrast (AA for normal text). The nearest named colour is Green.
Colour values
#338800#338800
HEX#338800
HEX (short)#380
RGBrgb(51, 136, 0)
RGB (0–1)0.2, 0.5333, 0
RGB percentages20%, 53.3%, 0%
HSLhsl(97.5, 100%, 26.7%)
HSV / HSBhsv(97.5, 100%, 53.3%)
CMYK62.5%, 0%, 100%, 46.7%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer3,377,152
CSS custom property--colour: #338800;
Brightness & contrast
Relative luminance0.18312WCAG 2.x, 0 is black and 1 is white
Perceived brightness107.9 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 4.66:1
Contrast with white4.5:1WCAG normal text: AA
Contrast with black4.66:1WCAG normal text: AA
Greyscale equivalent#6C6C6C
Inverted#CC77FF
Colour vision & accessibility
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text4.5:1WCAG large text: AAA
Contrast with black, large text4.66:1WCAG large text: AAA
Named colours
Hue familygreen
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#550088
Analogous#778800, #008811
Triadic#003388, #880033
Split complementary#110088, #880077
Tetradic#007788, #550088, #881100
Tints, shades & saturation
Channel breakdown
R51
G136
B0
Red51 (20%)
Green136 (53.3%)
Blue0 (0%)
Hue97.5°
Saturation (HSL)100%
Lightness26.67%
Dominant channelGreen
Hex per channelR 33 · G 88 · B 00
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Harmonies
Similar named colours
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