Number
47
- Positive
- Odd
- Prime
- 2 digits
47 is an odd 2-digit integer and a prime number. It has 2 divisors and a digital root of 2.
Number properties
ParityOddnot divisible by 2
SignPositive
PrimalityPrime
Absolute value47
Digit count2
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 factorisation47
Distinct prime factors147
Number of divisors2
Sum of divisors σ(n)48
Aliquot sum1sum of the proper divisors
ClassificationDeficientthe aliquot sum is less than the number
Euler's totient φ(n)46integers below n that share no factor with it
SquarefreeYesno repeated prime factor
All divisors1, 472 in total
Arithmetic
Representations
Decimal47
Binary1011116 bits
Octal57
Hexadecimal2F
Base 361B
Roman numeralXLVII
In wordsforty-seven
Ordinalforty-seventh
Scientific notation4.7 × 10^1
Engineering notation47
Nearest landmarks
Powers & multiples
47 to the power 22,209
47 to the power 3103,823
47 to the power 44,879,681
47 to the power 5229,345,007
First ten multiples47, 94, 141, 188, 235, 282, 329, 376, 423, 470
Powers of twoBetween 2^5 (32) and 2^6 (64)
Divisibility tests
Divisible by 2No, remainder 1
Divisible by 3No, remainder 2
Divisible by 4No, remainder 3
Divisible by 5No, remainder 2
Divisible by 6No, remainder 5
Divisible by 7No, remainder 5
Divisible by 8No, remainder 7
Divisible by 9No, remainder 2
Divisible by 10No, remainder 7
Divisible by 11No, remainder 3
Divisible by 12No, remainder 11
Divisible by 100No, remainder 47
Collatz (3n + 1) trajectory
Steps to reach 1104the total stopping time
Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven
First steps47 → 142 → 71 → 214 → 107 → 322 → 161 → 484 → 242 → 121 → …
Last steps… → 5 → 16 → 8 → 4 → 2 → 1
As a percentage & fraction
As a percentage4,700%
47% as a decimal0.47
47% of 10047
47% of 1,000470
As a fraction of 10047/100
Read another way
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