The number 42490
42490 is a composite number with 16 divisors. Its prime factorisation is 2 × 5 × 7 × 607. Divisors (16): 1, 2, 5, 7, 10, 14, 35, 70, 607, 1214, 3035, 4249, 6070, 8498, 21245, 42490.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
42490 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
42490 is composite. Its prime factorisation is
- 3
The divisors add up to 87552; without 42490 itself that is 45062, so 42490 is abundant (45062 is more than 42490). Euler's totient φ(42490) = 14544 numbers up to 42490 share no factor with it.
- 4
The digits of 42490 add up to 19, and repeating that until one digit is left gives the digital root 1. The Collatz sequence (halve if even, else 3n+1) takes 101 steps to reach 1.
LaTeX source of the formulas on this page
\[ 42490 = 2 \times 5 \times 7 \times 607 \]
42490 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 16 |
| Sum of divisors | 87552 |
| Euler totient φ(n) | 14544 |
| Square | 1805400100 |
| Cube | 76711450249000 |
| Square root | 206.131026 |
| Digit sum / digital root | 19 / 1 |
| Collatz steps to 1 | 101 |
| Scientific notation | 4.249 × |
42490 in other forms
| Form | Value |
|---|---|
| In words | forty-two thousand four hundred and ninety |
| Binary (base 2) | 1010010111111010 |
| Octal (base 8) | 122772 |
| Hexadecimal (base 16) | A5FA |
| Base 3 | 2011021201 |
| As time | 42490 seconds = 11 h 48 min 10 s |
Is 42490 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (42490 ÷ 2 = 21245) | 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 | Yes (42490 ÷ 5 = 8498) | 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 | Yes (42490 ÷ 7 = 6070) | 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 1) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | Yes (42490 ÷ 10 = 4249) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 8) | 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 42490 a prime number?
No. 42490 = 2 × 5 × 7 × 607, so it is divisible by 2.
What are the factors of 42490?
1, 2, 5, 7, 10, 14, 35, 70, 607, 1214, 3035, 4249, 6070, 8498, 21245, 42490.
What is 42490 in binary?
1010010111111010 (hexadecimal A5FA, octal 122772).
What is the square root of 42490?
About 206.1310.
Is 42490 divisible by 3?
No. Its digits add up to 19, which is not a multiple of 3.
What is special about the number 42490?
It is a composite number with 16 divisors.