Number
2
- Positive
- Even
- Prime
- 1 digit
2 is an even 1-digit integer and a prime number. It has 2 divisors and a digital root of 2.
The canonical address for this page is /2.
Number properties
ParityEvendivisible by 2
SignPositive
PrimalityPrime
Absolute value2
Digit count1
Digit sum2
Digital root2repeated digit sum
PalindromicYesreads the same backwards
Fibonacci numberYes, F(3)
Happy numberNosquared-digit sums reach 1
Harshad numberYesdivisible by its own digit sum
Armstrong numberYesdigits raised to the digit count sum to itself
Factors & divisors
Prime factorisation2
Distinct prime factors12
Number of divisors2
Sum of divisors σ(n)3
Aliquot sum1sum of the proper divisors
ClassificationDeficientthe aliquot sum is less than the number
Euler's totient φ(n)1integers below n that share no factor with it
SquarefreeYesno repeated prime factor
All divisors1, 22 in total
Arithmetic
Representations
Decimal2
Binary102 bits
Octal2
Hexadecimal2
Base 362
Roman numeralII
In wordstwo
Ordinalsecond
Scientific notation2 × 10^0
Engineering notation2
Powers & multiples
2 to the power 24
2 to the power 38
2 to the power 416
2 to the power 532
First ten multiples2, 4, 6, 8, 10, 12, 14, 16, 18, 20
Powers of twoExactly 2^1
Divisibility tests
Divisible by 2Yes
Divisible by 3No, remainder 2
Divisible by 4No, remainder 2
Divisible by 5No, remainder 2
Divisible by 6No, remainder 2
Divisible by 7No, remainder 2
Divisible by 8No, remainder 2
Divisible by 9No, remainder 2
Divisible by 10No, remainder 2
Divisible by 11No, remainder 2
Divisible by 12No, remainder 2
Divisible by 100No, remainder 2
Collatz (3n + 1) trajectory
Steps to reach 11the total stopping time
Highest value reached2
Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven
First steps2 → 1
As a percentage & fraction
As a percentage200%
2% as a decimal0.02
2% of 1002
2% of 1,00020
As a fraction of 1002/100
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Derived from 2
Other readings
Also reads as
#000002 (colour)
- #000002
- Blue
- Dark
- Nearest: Black
#000002 is a blue with RGB values 0, 0, 2 and HSL 240°, 100%, 0%. It is a dark colour, so white text on it reaches 21:1 contrast (AAA for normal text). The nearest named colour is Black.
Colour values
#000002#000002
HEX#000002
RGBrgb(0, 0, 2)
RGB (0–1)0, 0, 0.0078
RGB percentages0%, 0%, 0.8%
HSLhsl(240, 100%, 0.4%)
HSV / HSBhsv(240, 100%, 0.8%)
CMYK100%, 100%, 0%, 99.2%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2
CSS custom property--colour: #000002;
Brightness & contrast
Relative luminance0.00004WCAG 2.x, 0 is black and 1 is white
Perceived brightness0.7 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 20.98:1
Contrast with white20.98:1WCAG normal text: AAA
Contrast with black1:1WCAG normal text: Fail
Greyscale equivalent#000000
Inverted#FFFFFD
Colour vision & accessibility
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text20.98:1WCAG large text: AAA
Contrast with black, large text1:1WCAG large text: Fail
Named colours
Hue familyblue
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#020200
Analogous#000102, #010002
Triadic#020000, #000200
Split complementary#020100, #010200
Tetradic#020001, #020200, #000201
Tints, shades & saturation
Channel breakdown
R0
G0
B2
Red0 (0%)
Green0 (0%)
Blue2 (0.8%)
Hue240°
Saturation (HSL)100%
Lightness0.39%
Dominant channelBlue
Hex per channelR 00 · G 00 · B 02
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