The number 42442
42442 is a composite number with 4 divisors. Its prime factorisation is 2 × 21221. Divisors (4): 1, 2, 21221, 42442.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 42442: a semiprime: 2 × 21221, the product of two primes.
- 2
42442 is composite. Its prime factorisation is
- 3
The divisors add up to 63666; without 42442 itself that is 21224, so 42442 is deficient (21224 is less than 42442). Euler's totient φ(42442) = 21220 numbers up to 42442 share no factor with it.
- 4
The digits of 42442 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 101 steps to reach 1.
LaTeX source of the formulas on this page
\[ 42442 = 2 \times 21221 \]
42442 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 63666 |
| Euler totient φ(n) | 21220 |
| Square | 1801323364 |
| Cube | 76451766214888 |
| Square root | 206.014563 |
| Digit sum / digital root | 16 / 7 |
| Collatz steps to 1 | 101 |
| Scientific notation | 4.2442 × |
42442 in other forms
| Form | Value |
|---|---|
| In words | forty-two thousand four hundred and forty-two |
| Binary (base 2) | 1010010111001010 |
| Octal (base 8) | 122712 |
| Hexadecimal (base 16) | A5CA |
| Base 3 | 2011012221 |
| As time | 42442 seconds = 11 h 47 min 22 s |
Is 42442 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (42442 ÷ 2 = 21221) | 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 2) | 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 1) | 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 2) | 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 2) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 4) | 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 42442 a prime number?
No. 42442 = 2 × 21221, so it is divisible by 2.
What are the factors of 42442?
1, 2, 21221, 42442.
What is 42442 in binary?
1010010111001010 (hexadecimal A5CA, octal 122712).
What is the square root of 42442?
About 206.0146.
Is 42442 divisible by 3?
No. Its digits add up to 16, which is not a multiple of 3.
What is special about the number 42442?
42442 is a semiprime: 2 × 21221, the product of two primes.