The number 42489
42489 is a composite number with 6 divisors. Its prime factorisation is × 4721. Divisors (6): 1, 3, 9, 4721, 14163, 42489.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
42489 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
42489 is composite. Its prime factorisation is
- 3
The divisors add up to 61386; without 42489 itself that is 18897, so 42489 is deficient (18897 is less than 42489). Euler's totient φ(42489) = 28320 numbers up to 42489 share no factor with it.
- 4
The digits of 42489 add up to 27, and repeating that until one digit is left gives the digital root 9. The Collatz sequence (halve if even, else 3n+1) takes 57 steps to reach 1.
LaTeX source of the formulas on this page
\[ 42489 = 3^{2} \times 4721 \]42489 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 6 |
| Sum of divisors | 61386 |
| Euler totient φ(n) | 28320 |
| Square | 1805315121 |
| Cube | 76706034176169 |
| Square root | 206.128601 (= 3√4721) |
| Digit sum / digital root | 27 / 9 |
| Collatz steps to 1 | 57 |
| Scientific notation | 4.2489 × |
42489 in other forms
| Form | Value |
|---|---|
| In words | forty-two thousand four hundred and eighty-nine |
| Binary (base 2) | 1010010111111001 |
| Octal (base 8) | 122771 |
| Hexadecimal (base 16) | A5F9 |
| Base 3 | 2011021200 |
| As time | 42489 seconds = 11 h 48 min 9 s |
Is 42489 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 | Yes (42489 ÷ 3 = 14163) | 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 4) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 3) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 6) | 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 1) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | Yes (42489 ÷ 9 = 4721) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 9) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 7) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 9) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 42489 a prime number?
No. 42489 = × 4721, so it is divisible by 3.
What are the factors of 42489?
1, 3, 9, 4721, 14163, 42489.
What is 42489 in binary?
1010010111111001 (hexadecimal A5F9, octal 122771).
What is the square root of 42489?
About 206.1286, exactly 3√4721.
Is 42489 divisible by 3?
Yes. Its digits add up to 27, a multiple of 3.
What is special about the number 42489?
It is a composite number with 6 divisors.