The number 47139
47139 is a composite number with 8 divisors. Its prime factorisation is 3 × 19 × 827. Divisors (8): 1, 3, 19, 57, 827, 2481, 15713, 47139.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
47139 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
47139 is composite. Its prime factorisation is
- 3
The divisors add up to 66240; without 47139 itself that is 19101, so 47139 is deficient (19101 is less than 47139). Euler's totient φ(47139) = 29736 numbers up to 47139 share no factor with it.
- 4
The digits of 47139 add up to 24, and repeating that until one digit is left gives the digital root 6. The Collatz sequence (halve if even, else 3n+1) takes 83 steps to reach 1.
LaTeX source of the formulas on this page
\[ 47139 = 3 \times 19 \times 827 \]
47139 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 66240 |
| Euler totient φ(n) | 29736 |
| Square | 2222085321 |
| Cube | 104746879946619 |
| Square root | 217.115177 |
| Digit sum / digital root | 24 / 6 |
| Collatz steps to 1 | 83 |
| Scientific notation | 4.7139 × |
47139 in other forms
| Form | Value |
|---|---|
| In words | forty-seven thousand one hundred and thirty-nine |
| Binary (base 2) | 1011100000100011 |
| Octal (base 8) | 134043 |
| Hexadecimal (base 16) | B823 |
| Base 3 | 2101122220 |
| As time | 47139 seconds = 13 h 5 min 39 s |
Is 47139 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | No (remainder 1) | A number is divisible by 2 if the last digit is even (0, 2, 4, 6, 8). |
| 3 | Yes (47139 ÷ 3 = 15713) | A number is divisible by 3 if the digits add up to a multiple of 3. |
| 4 | No (remainder 3) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | No (remainder 4) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 3) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 1) | A number is divisible by 7 if double the last digit and subtract it from the rest: the result is a multiple of 7. |
| 8 | No (remainder 3) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 6) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 9) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 4) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 3) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 47139 a prime number?
No. 47139 = 3 × 19 × 827, so it is divisible by 3.
What are the factors of 47139?
1, 3, 19, 57, 827, 2481, 15713, 47139.
What is 47139 in binary?
1011100000100011 (hexadecimal B823, octal 134043).
What is the square root of 47139?
About 217.1152.
Is 47139 divisible by 3?
Yes. Its digits add up to 24, a multiple of 3.
What is special about the number 47139?
It is a composite number with 8 divisors.