The number 42789
42789 is a composite number with 8 divisors. Its prime factorisation is 3 × 17 × 839. Divisors (8): 1, 3, 17, 51, 839, 2517, 14263, 42789.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
42789 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
42789 is composite. Its prime factorisation is
- 3
The divisors add up to 60480; without 42789 itself that is 17691, so 42789 is deficient (17691 is less than 42789). Euler's totient φ(42789) = 26816 numbers up to 42789 share no factor with it.
- 4
The digits of 42789 add up to 30, and repeating that until one digit is left gives the digital root 3. The Collatz sequence (halve if even, else 3n+1) takes 194 steps to reach 1.
LaTeX source of the formulas on this page
\[ 42789 = 3 \times 17 \times 839 \]
42789 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 60480 |
| Euler totient φ(n) | 26816 |
| Square | 1830898521 |
| Cube | 78342316815069 |
| Square root | 206.855022 |
| Digit sum / digital root | 30 / 3 |
| Collatz steps to 1 | 194 |
| Scientific notation | 4.2789 × |
42789 in other forms
| Form | Value |
|---|---|
| In words | forty-two thousand seven hundred and eighty-nine |
| Binary (base 2) | 1010011100100101 |
| Octal (base 8) | 123445 |
| Hexadecimal (base 16) | A725 |
| Base 3 | 2011200210 |
| As time | 42789 seconds = 11 h 53 min 9 s |
Is 42789 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 (42789 ÷ 3 = 14263) | 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 5) | 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 3) | 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 10) | 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 42789 a prime number?
No. 42789 = 3 × 17 × 839, so it is divisible by 3.
What are the factors of 42789?
1, 3, 17, 51, 839, 2517, 14263, 42789.
What is 42789 in binary?
1010011100100101 (hexadecimal A725, octal 123445).
What is the square root of 42789?
About 206.8550.
Is 42789 divisible by 3?
Yes. Its digits add up to 30, a multiple of 3.
What is special about the number 42789?
It is a composite number with 8 divisors.