The number 42481
42481 is a composite number with 4 divisors. Its prime factorisation is 23 × 1847. Divisors (4): 1, 23, 1847, 42481.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 42481: a semiprime: 23 × 1847, the product of two primes.
- 2
42481 is composite. Its prime factorisation is
- 3
The divisors add up to 44352; without 42481 itself that is 1871, so 42481 is deficient (1871 is less than 42481). Euler's totient φ(42481) = 40612 numbers up to 42481 share no factor with it.
- 4
The digits of 42481 add up to 19, and repeating that until one digit is left gives the digital root 1. The Collatz sequence (halve if even, else 3n+1) takes 57 steps to reach 1.
LaTeX source of the formulas on this page
\[ 42481 = 23 \times 1847 \]
42481 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 44352 |
| Euler totient φ(n) | 40612 |
| Square | 1804635361 |
| Cube | 76662714770641 |
| Square root | 206.109194 |
| Digit sum / digital root | 19 / 1 |
| Collatz steps to 1 | 57 |
| Scientific notation | 4.2481 × |
42481 in other forms
| Form | Value |
|---|---|
| In words | forty-two thousand four hundred and eighty-one |
| Binary (base 2) | 1010010111110001 |
| Octal (base 8) | 122761 |
| Hexadecimal (base 16) | A5F1 |
| Base 3 | 2011021101 |
| As time | 42481 seconds = 11 h 48 min 1 s |
Is 42481 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 | No (remainder 1) | 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 5) | 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 1) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 10) | 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 42481 a prime number?
No. 42481 = 23 × 1847, so it is divisible by 23.
What are the factors of 42481?
1, 23, 1847, 42481.
What is 42481 in binary?
1010010111110001 (hexadecimal A5F1, octal 122761).
What is the square root of 42481?
About 206.1092.
Is 42481 divisible by 3?
No. Its digits add up to 19, which is not a multiple of 3.
What is special about the number 42481?
42481 is a semiprime: 23 × 1847, the product of two primes.