The number 47665
47665 is a composite number with 4 divisors. Its prime factorisation is 5 × 9533. Divisors (4): 1, 5, 9533, 47665.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 47665: a semiprime: 5 × 9533, the product of two primes.
- 2
47665 is composite. Its prime factorisation is
- 3
The divisors add up to 57204; without 47665 itself that is 9539, so 47665 is deficient (9539 is less than 47665). Euler's totient φ(47665) = 38128 numbers up to 47665 share no factor with it.
- 4
The digits of 47665 add up to 28, and repeating that until one digit is left gives the digital root 1. The Collatz sequence (halve if even, else 3n+1) takes 101 steps to reach 1.
LaTeX source of the formulas on this page
\[ 47665 = 5 \times 9533 \]
47665 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 57204 |
| Euler totient φ(n) | 38128 |
| Square | 2271952225 |
| Cube | 108292602804625 |
| Square root | 218.323155 |
| Digit sum / digital root | 28 / 1 |
| Collatz steps to 1 | 101 |
| Scientific notation | 4.7665 × |
47665 in other forms
| Form | Value |
|---|---|
| In words | forty-seven thousand six hundred and sixty-five |
| Binary (base 2) | 1011101000110001 |
| Octal (base 8) | 135061 |
| Hexadecimal (base 16) | BA31 |
| Base 3 | 2102101101 |
| As time | 47665 seconds = 13 h 14 min 25 s |
Is 47665 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 | No (remainder 1) | A number is divisible by 3 if the digits add up to a multiple of 3. |
| 4 | No (remainder 1) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | Yes (47665 ÷ 5 = 9533) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 1) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 2) | 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 1) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 1) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 5) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 2) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 1) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 47665 a prime number?
No. 47665 = 5 × 9533, so it is divisible by 5.
What are the factors of 47665?
1, 5, 9533, 47665.
What is 47665 in binary?
1011101000110001 (hexadecimal BA31, octal 135061).
What is the square root of 47665?
About 218.3232.
Is 47665 divisible by 3?
No. Its digits add up to 28, which is not a multiple of 3.
What is special about the number 47665?
47665 is a semiprime: 5 × 9533, the product of two primes.