The number 42493
42493 is a composite number with 4 divisors. Its prime factorisation is 11 × 3863. Divisors (4): 1, 11, 3863, 42493.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 42493: a semiprime: 11 × 3863, the product of two primes.
- 2
42493 is composite. Its prime factorisation is
- 3
The divisors add up to 46368; without 42493 itself that is 3875, so 42493 is deficient (3875 is less than 42493). Euler's totient φ(42493) = 38620 numbers up to 42493 share no factor with it.
- 4
The digits of 42493 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 101 steps to reach 1.
LaTeX source of the formulas on this page
\[ 42493 = 11 \times 3863 \]
42493 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 46368 |
| Euler totient φ(n) | 38620 |
| Square | 1805655049 |
| Cube | 76727699997157 |
| Square root | 206.138303 |
| Digit sum / digital root | 22 / 4 |
| Collatz steps to 1 | 101 |
| Scientific notation | 4.2493 × |
42493 in other forms
| Form | Value |
|---|---|
| In words | forty-two thousand four hundred and ninety-three |
| Binary (base 2) | 1010010111111101 |
| Octal (base 8) | 122775 |
| Hexadecimal (base 16) | A5FD |
| Base 3 | 2011021211 |
| As time | 42493 seconds = 11 h 48 min 13 s |
Is 42493 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 3) | 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 3) | 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 5) | 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 3) | A number is divisible by 10 if the last digit is 0. |
| 11 | Yes (42493 ÷ 11 = 3863) | 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 42493 a prime number?
No. 42493 = 11 × 3863, so it is divisible by 11.
What are the factors of 42493?
1, 11, 3863, 42493.
What is 42493 in binary?
1010010111111101 (hexadecimal A5FD, octal 122775).
What is the square root of 42493?
About 206.1383.
Is 42493 divisible by 3?
No. Its digits add up to 22, which is not a multiple of 3.
What is special about the number 42493?
42493 is a semiprime: 11 × 3863, the product of two primes.