The number 42445
42445 is a composite number with 8 divisors. Its prime factorisation is 5 × 13 × 653. Divisors (8): 1, 5, 13, 65, 653, 3265, 8489, 42445.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
42445 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
42445 is composite. Its prime factorisation is
- 3
The divisors add up to 54936; without 42445 itself that is 12491, so 42445 is deficient (12491 is less than 42445). Euler's totient φ(42445) = 31296 numbers up to 42445 share no factor with it.
- 4
The digits of 42445 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
\[ 42445 = 5 \times 13 \times 653 \]
42445 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 54936 |
| Euler totient φ(n) | 31296 |
| Square | 1801578025 |
| Cube | 76467979271125 |
| Square root | 206.021844 |
| Digit sum / digital root | 19 / 1 |
| Collatz steps to 1 | 101 |
| Scientific notation | 4.2445 × |
42445 in other forms
| Form | Value |
|---|---|
| In words | forty-two thousand four hundred and forty-five |
| Binary (base 2) | 1010010111001101 |
| Octal (base 8) | 122715 |
| Hexadecimal (base 16) | A5CD |
| Base 3 | 2011020001 |
| As time | 42445 seconds = 11 h 47 min 25 s |
Is 42445 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 (42445 ÷ 5 = 8489) | 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 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 1) | 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 7) | 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 42445 a prime number?
No. 42445 = 5 × 13 × 653, so it is divisible by 5.
What are the factors of 42445?
1, 5, 13, 65, 653, 3265, 8489, 42445.
What is 42445 in binary?
1010010111001101 (hexadecimal A5CD, octal 122715).
What is the square root of 42445?
About 206.0218.
Is 42445 divisible by 3?
No. Its digits add up to 19, which is not a multiple of 3.
What is special about the number 42445?
It is a composite number with 8 divisors.