Number
39
- Positive
- Odd
- Composite
- 2 digits
39 is an odd 2-digit integer and a composite number. It has 4 divisors and a digital root of 3.
Number properties
ParityOddnot divisible by 2
SignPositive
PrimalityComposite
Absolute value39
Digit count2
Digit sum12
Digital root3repeated digit sum
PalindromicNoreads differently backwards
Happy numberNosquared-digit sums reach 1
Harshad numberNodivisible by its own digit sum
Factors & divisors
Prime factorisation3 × 13
Distinct prime factors23, 13
Number of divisors4
Sum of divisors σ(n)56
Aliquot sum17sum of the proper divisors
ClassificationDeficientthe aliquot sum is less than the number
Euler's totient φ(n)24integers below n that share no factor with it
SquarefreeYesno repeated prime factor
All divisors1, 3, 13, 394 in total
Arithmetic
Representations
Decimal39
Binary1001116 bits
Octal47
Hexadecimal27
Base 3613
Roman numeralXXXIX
In wordsthirty-nine
Ordinalthirty-ninth
Scientific notation3.9 × 10^1
Engineering notation39
Nearest landmarks
Powers & multiples
39 to the power 21,521
39 to the power 359,319
39 to the power 42,313,441
39 to the power 590,224,199
First ten multiples39, 78, 117, 156, 195, 234, 273, 312, 351, 390
Powers of twoBetween 2^5 (32) and 2^6 (64)
Divisibility tests
Divisible by 2No, remainder 1
Divisible by 3Yes
Divisible by 4No, remainder 3
Divisible by 5No, remainder 4
Divisible by 6No, remainder 3
Divisible by 7No, remainder 4
Divisible by 8No, remainder 7
Divisible by 9No, remainder 3
Divisible by 10No, remainder 9
Divisible by 11No, remainder 6
Divisible by 12No, remainder 3
Divisible by 100No, remainder 39
Collatz (3n + 1) trajectory
Steps to reach 134the total stopping time
Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven
First steps39 → 118 → 59 → 178 → 89 → 268 → 134 → 67 → 202 → 101 → …
Last steps… → 5 → 16 → 8 → 4 → 2 → 1
As a percentage & fraction
As a percentage3,900%
39% as a decimal0.39
39% of 10039
39% of 1,000390
As a fraction of 10039/100
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