Number
10
- Positive
- Even
- Composite
- 2 digits
10 is an even 2-digit integer and a composite number. It has 4 divisors and a digital root of 1.
Number properties
ParityEvendivisible by 2
SignPositive
PrimalityComposite
Absolute value10
Digit count2
Digit sum1
Digital root1repeated digit sum
PalindromicNoreads differently backwards
Triangular numberYes, the 4th triangular number
Happy numberYessquared-digit sums reach 1
Harshad numberYesdivisible by its own digit sum
Factors & divisors
Prime factorisation2 × 5
Distinct prime factors22, 5
Number of divisors4
Sum of divisors σ(n)18
Aliquot sum8sum of the proper divisors
ClassificationDeficientthe aliquot sum is less than the number
Euler's totient φ(n)4integers below n that share no factor with it
SquarefreeYesno repeated prime factor
All divisors1, 2, 5, 104 in total
Arithmetic
Representations
Decimal10
Binary10104 bits
Octal12
HexadecimalA
Base 36A
Roman numeralX
In wordsten
Ordinaltenth
Scientific notation1 × 10^1
Engineering notation10
Nearest landmarks
Powers & multiples
10 to the power 2100
10 to the power 31,000
10 to the power 410,000
10 to the power 5100,000
First ten multiples10, 20, 30, 40, 50, 60, 70, 80, 90, 100
Powers of twoBetween 2^3 (8) and 2^4 (16)
Divisibility tests
Divisible by 2Yes
Divisible by 3No, remainder 1
Divisible by 4No, remainder 2
Divisible by 5Yes
Divisible by 6No, remainder 4
Divisible by 7No, remainder 3
Divisible by 8No, remainder 2
Divisible by 9No, remainder 1
Divisible by 10Yes
Divisible by 11No, remainder 10
Divisible by 12No, remainder 10
Divisible by 100No, remainder 10
Collatz (3n + 1) trajectory
Steps to reach 16the total stopping time
Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven
First steps10 → 5 → 16 → 8 → 4 → 2 → 1
As a percentage & fraction
As a percentage1,000%
10% as a decimal0.1
10% of 10010
10% of 1,000100
As a fraction of 10010/100
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