The number 42745
42745 is a composite number with 8 divisors. Its prime factorisation is 5 × 83 × 103. Divisors (8): 1, 5, 83, 103, 415, 515, 8549, 42745.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
42745 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
42745 is composite. Its prime factorisation is
- 3
The divisors add up to 52416; without 42745 itself that is 9671, so 42745 is deficient (9671 is less than 42745). Euler's totient φ(42745) = 33456 numbers up to 42745 share no factor with it.
- 4
The digits of 42745 add up to 22, and repeating that until one digit is left gives the digital root 4. The Collatz sequence (halve if even, else 3n+1) takes 57 steps to reach 1.
LaTeX source of the formulas on this page
\[ 42745 = 5 \times 83 \times 103 \]
42745 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 52416 |
| Euler totient φ(n) | 33456 |
| Square | 1827135025 |
| Cube | 78100886643625 |
| Square root | 206.748640 |
| Digit sum / digital root | 22 / 4 |
| Collatz steps to 1 | 57 |
| Scientific notation | 4.2745 × |
42745 in other forms
| Form | Value |
|---|---|
| In words | forty-two thousand seven hundred and forty-five |
| Binary (base 2) | 1010011011111001 |
| Octal (base 8) | 123371 |
| Hexadecimal (base 16) | A6F9 |
| Base 3 | 2011122011 |
| As time | 42745 seconds = 11 h 52 min 25 s |
Is 42745 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 1) | 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 | Yes (42745 ÷ 5 = 8549) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 1) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 3) | 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 | No (remainder 4) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 5) | 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 1) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 42745 a prime number?
No. 42745 = 5 × 83 × 103, so it is divisible by 5.
What are the factors of 42745?
1, 5, 83, 103, 415, 515, 8549, 42745.
What is 42745 in binary?
1010011011111001 (hexadecimal A6F9, octal 123371).
What is the square root of 42745?
About 206.7486.
Is 42745 divisible by 3?
No. Its digits add up to 22, which is not a multiple of 3.
What is special about the number 42745?
It is a composite number with 8 divisors.