The number 42907
42907 is a composite number with 4 divisors. Its prime factorisation is 107 × 401. Divisors (4): 1, 107, 401, 42907.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 42907: a semiprime: 107 × 401, the product of two primes.
- 2
42907 is composite. Its prime factorisation is
- 3
The divisors add up to 43416; without 42907 itself that is 509, so 42907 is deficient (509 is less than 42907). Euler's totient φ(42907) = 42400 numbers up to 42907 share no factor with it.
- 4
The digits of 42907 add up to 22, and repeating that until one digit is left gives the digital root 4. The Collatz sequence (halve if even, else 3n+1) takes 163 steps to reach 1.
LaTeX source of the formulas on this page
\[ 42907 = 107 \times 401 \]
42907 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 43416 |
| Euler totient φ(n) | 42400 |
| Square | 1841010649 |
| Cube | 78992243916643 |
| Square root | 207.140049 |
| Digit sum / digital root | 22 / 4 |
| Collatz steps to 1 | 163 |
| Scientific notation | 4.2907 × |
42907 in other forms
| Form | Value |
|---|---|
| In words | forty-two thousand nine hundred and seven |
| Binary (base 2) | 1010011110011011 |
| Octal (base 8) | 123633 |
| Hexadecimal (base 16) | A79B |
| Base 3 | 2011212011 |
| As time | 42907 seconds = 11 h 55 min 7 s |
Is 42907 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 3) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | No (remainder 2) | 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 4) | 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 4) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 7) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 7) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 7) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 42907 a prime number?
No. 42907 = 107 × 401, so it is divisible by 107.
What are the factors of 42907?
1, 107, 401, 42907.
What is 42907 in binary?
1010011110011011 (hexadecimal A79B, octal 123633).
What is the square root of 42907?
About 207.1400.
Is 42907 divisible by 3?
No. Its digits add up to 22, which is not a multiple of 3.
What is special about the number 42907?
42907 is a semiprime: 107 × 401, the product of two primes.