The number 47739
47739 is a composite number with 4 divisors. Its prime factorisation is 3 × 15913. Divisors (4): 1, 3, 15913, 47739.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 47739: a semiprime: 3 × 15913, the product of two primes.
- 2
47739 is composite. Its prime factorisation is
- 3
The divisors add up to 63656; without 47739 itself that is 15917, so 47739 is deficient (15917 is less than 47739). Euler's totient φ(47739) = 31824 numbers up to 47739 share no factor with it.
- 4
The digits of 47739 add up to 30, and repeating that until one digit is left gives the digital root 3. The Collatz sequence (halve if even, else 3n+1) takes 145 steps to reach 1.
LaTeX source of the formulas on this page
\[ 47739 = 3 \times 15913 \]
47739 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 63656 |
| Euler totient φ(n) | 31824 |
| Square | 2279012121 |
| Cube | 108797759644419 |
| Square root | 218.492563 |
| Digit sum / digital root | 30 / 3 |
| Collatz steps to 1 | 145 |
| Scientific notation | 4.7739 × |
47739 in other forms
| Form | Value |
|---|---|
| In words | forty-seven thousand seven hundred and thirty-nine |
| Binary (base 2) | 1011101001111011 |
| Octal (base 8) | 135173 |
| Hexadecimal (base 16) | BA7B |
| Base 3 | 2102111010 |
| As time | 47739 seconds = 13 h 15 min 39 s |
Is 47739 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 (47739 ÷ 3 = 15913) | 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 6) | 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 3) | 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 10) | 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 47739 a prime number?
No. 47739 = 3 × 15913, so it is divisible by 3.
What are the factors of 47739?
1, 3, 15913, 47739.
What is 47739 in binary?
1011101001111011 (hexadecimal BA7B, octal 135173).
What is the square root of 47739?
About 218.4926.
Is 47739 divisible by 3?
Yes. Its digits add up to 30, a multiple of 3.
What is special about the number 47739?
47739 is a semiprime: 3 × 15913, the product of two primes.