Number
16
- Positive
- Even
- Composite
- Perfect square
- 2 digits
16 is an even 2-digit integer and a composite number. It has 5 divisors and a digital root of 7.
Number properties
ParityEvendivisible by 2
SignPositive
PrimalityComposite
Absolute value16
Digit count2
Digit sum7
Digital root7repeated digit sum
PalindromicNoreads differently backwards
Perfect squareYes, 4²
Happy numberNosquared-digit sums reach 1
Harshad numberNodivisible by its own digit sum
Factors & divisors
Prime factorisation2^4
Distinct prime factors12
Number of divisors5
Sum of divisors σ(n)31
Aliquot sum15sum of the proper divisors
ClassificationDeficientthe aliquot sum is less than the number
Euler's totient φ(n)8integers below n that share no factor with it
SquarefreeNohas a repeated prime factor
All divisors1, 2, 4, 8, 165 in total
Arithmetic
Representations
Decimal16
Binary100005 bits
Octal20
Hexadecimal10
Base 36G
Roman numeralXVI
In wordssixteen
Ordinalsixteenth
Scientific notation1.6 × 10^1
Engineering notation16
Nearest landmarks
Powers & multiples
16 to the power 2256
16 to the power 34,096
16 to the power 465,536
16 to the power 51,048,576
First ten multiples16, 32, 48, 64, 80, 96, 112, 128, 144, 160
Powers of twoExactly 2^4
Divisibility tests
Divisible by 2Yes
Divisible by 3No, remainder 1
Divisible by 4Yes
Divisible by 5No, remainder 1
Divisible by 6No, remainder 4
Divisible by 7No, remainder 2
Divisible by 8Yes
Divisible by 9No, remainder 7
Divisible by 10No, remainder 6
Divisible by 11No, remainder 5
Divisible by 12No, remainder 4
Divisible by 100No, remainder 16
Collatz (3n + 1) trajectory
Steps to reach 14the total stopping time
Highest value reached16
Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven
First steps16 → 8 → 4 → 2 → 1
As a percentage & fraction
As a percentage1,600%
16% as a decimal0.16
16% of 10016
16% of 1,000160
As a fraction of 10016/100
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