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Number

290

  • Positive
  • Even
  • Composite
  • 3 digits

290 is an even 3-digit integer and a composite number. It has 8 divisors and a digital root of 2.

Number properties

ParityEvendivisible by 2
SignPositive
PrimalityComposite
Absolute value290
Digit count3
Digit sum11
Digital root2repeated digit sum
PalindromicNoreads differently backwards
Happy numberNosquared-digit sums reach 1
Harshad numberNodivisible by its own digit sum

Factors & divisors

Prime factorisation2 × 5 × 29
Distinct prime factors32, 5, 29
Number of divisors8
Sum of divisors σ(n)540
Aliquot sum250sum of the proper divisors
ClassificationDeficientthe aliquot sum is less than the number
Euler's totient φ(n)112integers below n that share no factor with it
SquarefreeYesno repeated prime factor
All divisors1, 2, 5, 10, 29, 58, 145, 2908 in total

Arithmetic

Previous number289
Next number291
Double580
Half145
Square84,100
Cube24,389,000
Square root17.029386366≈irrational, shown to 9 decimal places
Cube root6.619105948≈
Negation-290
Reciprocal0.0034482759≈
290 factorial6031611618387820976611797623561328567458… (590 digits)

Representations

Decimal290
Binary1001000109 bits
Octal442
Hexadecimal122
Base 3682
Roman numeralCCXC
In wordstwo hundred and ninety
Ordinaltwo hundred and ninetieth
Scientific notation2.9 × 10^2
Engineering notation290

Nearest landmarks

Next prime293+3
Previous prime283−7
Distance to nearest prime3
Nearest square below289
Nearest square above324

Powers & multiples

290 to the power 284,100
290 to the power 324,389,000
290 to the power 47,072,810,000
290 to the power 52,051,114,900,000
First ten multiples290, 580, 870, 1,160, 1,450, 1,740, 2,030, 2,320, 2,610, 2,900
Powers of twoBetween 2^8 (256) and 2^9 (512)

Divisibility tests

Divisible by 2Yes
Divisible by 3No, remainder 2
Divisible by 4No, remainder 2
Divisible by 5Yes
Divisible by 6No, remainder 2
Divisible by 7No, remainder 3
Divisible by 8No, remainder 2
Divisible by 9No, remainder 2
Divisible by 10Yes
Divisible by 11No, remainder 4
Divisible by 12No, remainder 2
Divisible by 100No, remainder 90

Collatz (3n + 1) trajectory

Steps to reach 1117the total stopping time
Highest value reached9,23231× the starting value
Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven
First steps290 → 145 → 436 → 218 → 109 → 328 → 164 → 82 → 41 → 124 → …
Last steps… → 5 → 16 → 8 → 4 → 2 → 1

As a percentage & fraction

As a percentage29,000%
290% as a decimal2.9
290% of 100290
290% of 1,0002,900
As a fraction of 100290/100

Read another way

As seconds4 minutes and 50 seconds
As bytes290 B
As a 24-bit colour#000122

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Neighbouring numbers

Nearby primes

Also reads as

#229900 (colour)

  • #229900
  • Green
  • Dark
  • Nearest: Green

#229900 is a green with RGB values 34, 153, 0 and HSL 107°, 100%, 30%. It is a dark colour, so black text on it reaches 5.6:1 contrast (AA for normal text). The nearest named colour is Green.

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Colour values

#229900#229900
HEX#229900
HEX (short)#290
RGBrgb(34, 153, 0)
RGB (0–1)0.1333, 0.6, 0
RGB percentages13.3%, 60%, 0%
HSLhsl(106.7, 100%, 30%)
HSV / HSBhsv(106.7, 100%, 60%)
CMYK77.8%, 0%, 100%, 40%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,267,392
CSS custom property--colour: #229900;

Brightness & contrast

Relative luminance0.23123WCAG 2.x, 0 is black and 1 is white
Perceived brightness118.7 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 5.62:1
Contrast with white3.73:1WCAG normal text: Fail
Contrast with black5.62:1WCAG normal text: AA
Greyscale equivalent#757575
Inverted#DD66FF

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#9D8A00no red cones; affects about 1% of men; ΔE 51.1 from the original
Deuteranopia#90811Fno green cones; the most common form, about 1% of men; ΔE 50.9 from the original
Tritanopia#009481no blue cones; rare, and affects men and women equally; ΔE 59.3 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text3.73:1WCAG large text: AA
Contrast with black, large text5.62:1WCAG large text: AAA

Named colours

Green · ΔE 12.3Forest green · ΔE 14.4Limegreen · ΔE 21.2Dark green · ΔE 27.4Olivedrab · ΔE 28.5Yellow green · ΔE 29.3
Nearest named CSS colourGreen (#008000)ΔE 12.26, a distinctly different colour
Hue familygreen
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#770099
Analogous#6F9900, #00992A
Triadic#002299, #990022
Split complementary#2A0099, #99006F
Tetradic#006F99, #770099, #992A00

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#88FF66
Lighter +30%#60FF33
Lighter +20%#39FF00
Lighter +10%#2DCC00
Darker −10%#176600
Darker −20%#0B3300
Darker −30%#000000
Darker −40%#000000
More saturated +25%#229900
Less saturated −25%#2D8613

Channel breakdown

R34
G153
B0
Red34 (13.3%)
Green153 (60%)
Blue0 (0%)
Hue106.67°
Saturation (HSL)100%
Lightness30%
Dominant channelGreen
Hex per channelR 22 · G 99 · B 00

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Every value on this page was computed from “290” by Nerdulator’s number engine. Nothing here was retrieved from a database of answers or written by a model.