The number 42646
42646 is a composite number with 4 divisors. Its prime factorisation is 2 × 21323. Divisors (4): 1, 2, 21323, 42646.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 42646: a semiprime: 2 × 21323, the product of two primes.
- 2
42646 is composite. Its prime factorisation is
- 3
The divisors add up to 63972; without 42646 itself that is 21326, so 42646 is deficient (21326 is less than 42646). Euler's totient φ(42646) = 21322 numbers up to 42646 share no factor with it.
- 4
The digits of 42646 add up to 22, and repeating that until one digit is left gives the digital root 4. The Collatz sequence (halve if even, else 3n+1) takes 57 steps to reach 1.
LaTeX source of the formulas on this page
\[ 42646 = 2 \times 21323 \]
42646 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 63972 |
| Euler totient φ(n) | 21322 |
| Square | 1818681316 |
| Cube | 77559483402136 |
| Square root | 206.509080 |
| Digit sum / digital root | 22 / 4 |
| Collatz steps to 1 | 57 |
| Scientific notation | 4.2646 × |
42646 in other forms
| Form | Value |
|---|---|
| In words | forty-two thousand six hundred and forty-six |
| Binary (base 2) | 1010011010010110 |
| Octal (base 8) | 123226 |
| Hexadecimal (base 16) | A696 |
| Base 3 | 2011111111 |
| As time | 42646 seconds = 11 h 50 min 46 s |
Is 42646 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (42646 ÷ 2 = 21323) | 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 1) | 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 4) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 6) | 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 10) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 42646 a prime number?
No. 42646 = 2 × 21323, so it is divisible by 2.
What are the factors of 42646?
1, 2, 21323, 42646.
What is 42646 in binary?
1010011010010110 (hexadecimal A696, octal 123226).
What is the square root of 42646?
About 206.5091.
Is 42646 divisible by 3?
No. Its digits add up to 22, which is not a multiple of 3.
What is special about the number 42646?
42646 is a semiprime: 2 × 21323, the product of two primes.