The number 42361
42361 is a composite number with 4 divisors. Its prime factorisation is 11 × 3851. Divisors (4): 1, 11, 3851, 42361.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 42361: a semiprime: 11 × 3851, the product of two primes.
- 2
42361 is composite. Its prime factorisation is
- 3
The divisors add up to 46224; without 42361 itself that is 3863, so 42361 is deficient (3863 is less than 42361). Euler's totient φ(42361) = 38500 numbers up to 42361 share no factor with it.
- 4
The digits of 42361 add up to 16, and repeating that until one digit is left gives the digital root 7. The Collatz sequence (halve if even, else 3n+1) takes 132 steps to reach 1.
LaTeX source of the formulas on this page
\[ 42361 = 11 \times 3851 \]
42361 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 46224 |
| Euler totient φ(n) | 38500 |
| Square | 1794454321 |
| Cube | 76014879491881 |
| Square root | 205.817881 |
| Digit sum / digital root | 16 / 7 |
| Collatz steps to 1 | 132 |
| Scientific notation | 4.2361 × |
42361 in other forms
| Form | Value |
|---|---|
| In words | forty-two thousand three hundred and sixty-one |
| Binary (base 2) | 1010010101111001 |
| Octal (base 8) | 122571 |
| Hexadecimal (base 16) | A579 |
| Base 3 | 2011002221 |
| As time | 42361 seconds = 11 h 46 min 1 s |
Is 42361 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 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 1) | 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 1) | A number is divisible by 10 if the last digit is 0. |
| 11 | Yes (42361 ÷ 11 = 3851) | 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 42361 a prime number?
No. 42361 = 11 × 3851, so it is divisible by 11.
What are the factors of 42361?
1, 11, 3851, 42361.
What is 42361 in binary?
1010010101111001 (hexadecimal A579, octal 122571).
What is the square root of 42361?
About 205.8179.
Is 42361 divisible by 3?
No. Its digits add up to 16, which is not a multiple of 3.
What is special about the number 42361?
42361 is a semiprime: 11 × 3851, the product of two primes.