The number 42389
42389 is a composite number with 8 divisors. Its prime factorisation is 19 × 23 × 97. Divisors (8): 1, 19, 23, 97, 437, 1843, 2231, 42389.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
42389 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
42389 is composite. Its prime factorisation is
- 3
The divisors add up to 47040; without 42389 itself that is 4651, so 42389 is deficient (4651 is less than 42389). Euler's totient φ(42389) = 38016 numbers up to 42389 share no factor with it.
- 4
The digits of 42389 add up to 26, and repeating that until one digit is left gives the digital root 8. The Collatz sequence (halve if even, else 3n+1) takes 101 steps to reach 1.
LaTeX source of the formulas on this page
\[ 42389 = 19 \times 23 \times 97 \]
42389 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 47040 |
| Euler totient φ(n) | 38016 |
| Square | 1796827321 |
| Cube | 76165713309869 |
| Square root | 205.885891 |
| Digit sum / digital root | 26 / 8 |
| Collatz steps to 1 | 101 |
| Scientific notation | 4.2389 × |
42389 in other forms
| Form | Value |
|---|---|
| In words | forty-two thousand three hundred and eighty-nine |
| Binary (base 2) | 1010010110010101 |
| Octal (base 8) | 122625 |
| Hexadecimal (base 16) | A595 |
| Base 3 | 2011010222 |
| As time | 42389 seconds = 11 h 46 min 29 s |
Is 42389 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 2) | 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 5) | 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 5) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 8) | 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 6) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 5) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 42389 a prime number?
No. 42389 = 19 × 23 × 97, so it is divisible by 19.
What are the factors of 42389?
1, 19, 23, 97, 437, 1843, 2231, 42389.
What is 42389 in binary?
1010010110010101 (hexadecimal A595, octal 122625).
What is the square root of 42389?
About 205.8859.
Is 42389 divisible by 3?
No. Its digits add up to 26, which is not a multiple of 3.
What is special about the number 42389?
It is a composite number with 8 divisors.