The number 42478
42478 is a composite number with 8 divisors. Its prime factorisation is 2 × 67 × 317. Divisors (8): 1, 2, 67, 134, 317, 634, 21239, 42478.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
42478 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
42478 is composite. Its prime factorisation is
- 3
The divisors add up to 64872; without 42478 itself that is 22394, so 42478 is deficient (22394 is less than 42478). Euler's totient φ(42478) = 20856 numbers up to 42478 share no factor with it.
- 4
The digits of 42478 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 101 steps to reach 1.
LaTeX source of the formulas on this page
\[ 42478 = 2 \times 67 \times 317 \]
42478 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 64872 |
| Euler totient φ(n) | 20856 |
| Square | 1804380484 |
| Cube | 76646474199352 |
| Square root | 206.101917 |
| Digit sum / digital root | 25 / 7 |
| Collatz steps to 1 | 101 |
| Scientific notation | 4.2478 × |
42478 in other forms
| Form | Value |
|---|---|
| In words | forty-two thousand four hundred and seventy-eight |
| Binary (base 2) | 1010010111101110 |
| Octal (base 8) | 122756 |
| Hexadecimal (base 16) | A5EE |
| Base 3 | 2011021021 |
| As time | 42478 seconds = 11 h 47 min 58 s |
Is 42478 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (42478 ÷ 2 = 21239) | 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 2) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | No (remainder 3) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 4) | 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 6) | 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 8) | 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 10) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 42478 a prime number?
No. 42478 = 2 × 67 × 317, so it is divisible by 2.
What are the factors of 42478?
1, 2, 67, 134, 317, 634, 21239, 42478.
What is 42478 in binary?
1010010111101110 (hexadecimal A5EE, octal 122756).
What is the square root of 42478?
About 206.1019.
Is 42478 divisible by 3?
No. Its digits add up to 25, which is not a multiple of 3.
What is special about the number 42478?
It is a composite number with 8 divisors.