The number 42494
42494 is a composite number with 4 divisors. Its prime factorisation is 2 × 21247. Divisors (4): 1, 2, 21247, 42494.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 42494: a happy number: repeatedly adding the squares of its digits reaches 1; a semiprime: 2 × 21247, the product of two primes.
- 2
42494 is composite. Its prime factorisation is
- 3
The divisors add up to 63744; without 42494 itself that is 21250, so 42494 is deficient (21250 is less than 42494). Euler's totient φ(42494) = 21246 numbers up to 42494 share no factor with it.
- 4
The digits of 42494 add up to 23, and repeating that until one digit is left gives the digital root 5. The Collatz sequence (halve if even, else 3n+1) takes 150 steps to reach 1.
LaTeX source of the formulas on this page
\[ 42494 = 2 \times 21247 \]
42494 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 63744 |
| Euler totient φ(n) | 21246 |
| Square | 1805740036 |
| Cube | 76733117089784 |
| Square root | 206.140729 |
| Digit sum / digital root | 23 / 5 |
| Collatz steps to 1 | 150 |
| Scientific notation | 4.2494 × |
42494 in other forms
| Form | Value |
|---|---|
| In words | forty-two thousand four hundred and ninety-four |
| Binary (base 2) | 1010010111111110 |
| Octal (base 8) | 122776 |
| Hexadecimal (base 16) | A5FE |
| Base 3 | 2011021212 |
| As time | 42494 seconds = 11 h 48 min 14 s |
Is 42494 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (42494 ÷ 2 = 21247) | A number is divisible by 2 if the last digit is even (0, 2, 4, 6, 8). |
| 3 | No (remainder 2) | 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 4) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 2) | 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 6) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 5) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 4) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 1) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 2) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 42494 a prime number?
No. 42494 = 2 × 21247, so it is divisible by 2.
What are the factors of 42494?
1, 2, 21247, 42494.
What is 42494 in binary?
1010010111111110 (hexadecimal A5FE, octal 122776).
What is the square root of 42494?
About 206.1407.
Is 42494 divisible by 3?
No. Its digits add up to 23, which is not a multiple of 3.
What is special about the number 42494?
42494 is a happy number: repeatedly adding the squares of its digits reaches 1; a semiprime: 2 × 21247, the product of two primes.