Number
389
- Positive
- Odd
- Prime
- 3 digits
389 is an odd 3-digit integer and a prime number. It has 2 divisors and a digital root of 2.
Number properties
ParityOddnot divisible by 2
SignPositive
PrimalityPrime
Absolute value389
Digit count3
Digit sum20
Digital root2repeated digit sum
PalindromicNoreads differently backwards
Happy numberNosquared-digit sums reach 1
Harshad numberNodivisible by its own digit sum
Factors & divisors
Prime factorisation389
Distinct prime factors1389
Number of divisors2
Sum of divisors σ(n)390
Aliquot sum1sum of the proper divisors
ClassificationDeficientthe aliquot sum is less than the number
Euler's totient φ(n)388integers below n that share no factor with it
SquarefreeYesno repeated prime factor
All divisors1, 3892 in total
Arithmetic
Representations
Decimal389
Binary1100001019 bits
Octal605
Hexadecimal185
Base 36AT
Roman numeralCCCLXXXIX
In wordsthree hundred and eighty-nine
Ordinalthree hundred and eighty-ninth
Scientific notation3.89 × 10^2
Engineering notation389
Nearest landmarks
Powers & multiples
389 to the power 2151,321
389 to the power 358,863,869
389 to the power 422,898,045,041
389 to the power 58,907,339,520,949
First ten multiples389, 778, 1,167, 1,556, 1,945, 2,334, 2,723, 3,112, 3,501, 3,890
Powers of twoBetween 2^8 (256) and 2^9 (512)
Divisibility tests
Divisible by 2No, remainder 1
Divisible by 3No, remainder 2
Divisible by 4No, remainder 1
Divisible by 5No, remainder 4
Divisible by 6No, remainder 5
Divisible by 7No, remainder 4
Divisible by 8No, remainder 5
Divisible by 9No, remainder 2
Divisible by 10No, remainder 9
Divisible by 11No, remainder 4
Divisible by 12No, remainder 5
Divisible by 100No, remainder 89
Collatz (3n + 1) trajectory
Steps to reach 1120the total stopping time
Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven
First steps389 → 1,168 → 584 → 292 → 146 → 73 → 220 → 110 → 55 → 166 → …
Last steps… → 5 → 16 → 8 → 4 → 2 → 1
As a percentage & fraction
As a percentage38,900%
389% as a decimal3.89
389% of 100389
389% of 1,0003,890
As a fraction of 100389/100
Read another way
Keep nerding
Every link below is a page Nerdulator can generate from what it already knows about this value.
Derived from 389
Other readings
Also reads as
#338899 (colour)
- #338899
- Cyan
- Dark
- Nearest: Cadetblue
#338899 is a cyan with RGB values 51, 136, 153 and HSL 190°, 50%, 40%. It is a dark colour, so black text on it reaches 5.1:1 contrast (AA for normal text). The nearest named colour is Cadetblue.
Colour values
#338899#338899
HEX#338899
HEX (short)#389
RGBrgb(51, 136, 153)
RGB (0–1)0.2, 0.5333, 0.6
RGB percentages20%, 53.3%, 60%
HSLhsl(190, 50%, 40%)
HSV / HSBhsv(190, 66.7%, 60%)
CMYK66.7%, 11.1%, 0%, 40%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer3,377,305
CSS custom property--colour: #338899;
Brightness & contrast
Relative luminance0.20612WCAG 2.x, 0 is black and 1 is white
Perceived brightness119.6 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 5.12:1
Contrast with white4.1:1WCAG normal text: Fail
Contrast with black5.12:1WCAG normal text: AA
Greyscale equivalent#777777
Inverted#CC7766
Colour vision & accessibility
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text4.1:1WCAG large text: AA
Contrast with black, large text5.12:1WCAG large text: AAA
Named colours
Hue familycyan
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#994433
Analogous#339977, #335599
Triadic#993388, #889933
Split complementary#993355, #997733
Tetradic#773399, #994433, #559933
Tints, shades & saturation
Channel breakdown
R51
G136
B153
Red51 (20%)
Green136 (53.3%)
Blue153 (60%)
Hue190°
Saturation (HSL)50%
Lightness40%
Dominant channelBlue
Hex per channelR 33 · G 88 · B 99
Keep nerding
Every link below is a page Nerdulator can generate from what it already knows about this value.
Nerdulate something else
Nothing in mind? Surprise me · today’s page