The number 42485
42485 is a composite number with 8 divisors. Its prime factorisation is 5 × 29 × 293. Divisors (8): 1, 5, 29, 145, 293, 1465, 8497, 42485.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
42485 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
42485 is composite. Its prime factorisation is
- 3
The divisors add up to 52920; without 42485 itself that is 10435, so 42485 is deficient (10435 is less than 42485). Euler's totient φ(42485) = 32704 numbers up to 42485 share no factor with it.
- 4
The digits of 42485 add up to 23, and repeating that until one digit is left gives the digital root 5. The Collatz sequence (halve if even, else 3n+1) takes 57 steps to reach 1.
LaTeX source of the formulas on this page
\[ 42485 = 5 \times 29 \times 293 \]
42485 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 52920 |
| Euler totient φ(n) | 32704 |
| Square | 1804975225 |
| Cube | 76684372434125 |
| Square root | 206.118898 |
| Digit sum / digital root | 23 / 5 |
| Collatz steps to 1 | 57 |
| Scientific notation | 4.2485 × |
42485 in other forms
| Form | Value |
|---|---|
| In words | forty-two thousand four hundred and eighty-five |
| Binary (base 2) | 1010010111110101 |
| Octal (base 8) | 122765 |
| Hexadecimal (base 16) | A5F5 |
| Base 3 | 2011021112 |
| As time | 42485 seconds = 11 h 48 min 5 s |
Is 42485 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 2) | 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 (42485 ÷ 5 = 8497) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 5) | 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 5) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 5) | 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 3) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 5) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 42485 a prime number?
No. 42485 = 5 × 29 × 293, so it is divisible by 5.
What are the factors of 42485?
1, 5, 29, 145, 293, 1465, 8497, 42485.
What is 42485 in binary?
1010010111110101 (hexadecimal A5F5, octal 122765).
What is the square root of 42485?
About 206.1189.
Is 42485 divisible by 3?
No. Its digits add up to 23, which is not a multiple of 3.
What is special about the number 42485?
It is a composite number with 8 divisors.