The number 42685
42685 is a composite number with 4 divisors. Its prime factorisation is 5 × 8537. Divisors (4): 1, 5, 8537, 42685.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 42685: a semiprime: 5 × 8537, the product of two primes.
- 2
42685 is composite. Its prime factorisation is
- 3
The divisors add up to 51228; without 42685 itself that is 8543, so 42685 is deficient (8543 is less than 42685). Euler's totient φ(42685) = 34144 numbers up to 42685 share no factor with it.
- 4
The digits of 42685 add up to 25, and repeating that until one digit is left gives the digital root 7. The Collatz sequence (halve if even, else 3n+1) takes 88 steps to reach 1.
LaTeX source of the formulas on this page
\[ 42685 = 5 \times 8537 \]
42685 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 51228 |
| Euler totient φ(n) | 34144 |
| Square | 1822009225 |
| Cube | 77772463769125 |
| Square root | 206.603485 |
| Digit sum / digital root | 25 / 7 |
| Collatz steps to 1 | 88 |
| Scientific notation | 4.2685 × |
42685 in other forms
| Form | Value |
|---|---|
| In words | forty-two thousand six hundred and eighty-five |
| Binary (base 2) | 1010011010111101 |
| Octal (base 8) | 123275 |
| Hexadecimal (base 16) | A6BD |
| Base 3 | 2011112221 |
| As time | 42685 seconds = 11 h 51 min 25 s |
Is 42685 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 (42685 ÷ 5 = 8537) | 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 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 5) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 7) | 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 5) | 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 42685 a prime number?
No. 42685 = 5 × 8537, so it is divisible by 5.
What are the factors of 42685?
1, 5, 8537, 42685.
What is 42685 in binary?
1010011010111101 (hexadecimal A6BD, octal 123275).
What is the square root of 42685?
About 206.6035.
Is 42685 divisible by 3?
No. Its digits add up to 25, which is not a multiple of 3.
What is special about the number 42685?
42685 is a semiprime: 5 × 8537, the product of two primes.