The number 42455
42455 is a composite number with 8 divisors. Its prime factorisation is 5 × 7 × 1213. Divisors (8): 1, 5, 7, 35, 1213, 6065, 8491, 42455.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 42455: a happy number: repeatedly adding the squares of its digits reaches 1.
- 2
42455 is composite. Its prime factorisation is
- 3
The divisors add up to 58272; without 42455 itself that is 15817, so 42455 is deficient (15817 is less than 42455). Euler's totient φ(42455) = 29088 numbers up to 42455 share no factor with it.
- 4
The digits of 42455 add up to 20, and repeating that until one digit is left gives the digital root 2. The Collatz sequence (halve if even, else 3n+1) takes 106 steps to reach 1.
LaTeX source of the formulas on this page
\[ 42455 = 5 \times 7 \times 1213 \]
42455 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 58272 |
| Euler totient φ(n) | 29088 |
| Square | 1802427025 |
| Cube | 76522039346375 |
| Square root | 206.046111 |
| Digit sum / digital root | 20 / 2 |
| Collatz steps to 1 | 106 |
| Scientific notation | 4.2455 × |
42455 in other forms
| Form | Value |
|---|---|
| In words | forty-two thousand four hundred and fifty-five |
| Binary (base 2) | 1010010111010111 |
| Octal (base 8) | 122727 |
| Hexadecimal (base 16) | A5D7 |
| Base 3 | 2011020102 |
| As time | 42455 seconds = 11 h 47 min 35 s |
Is 42455 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 3) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | Yes (42455 ÷ 5 = 8491) | 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 | Yes (42455 ÷ 7 = 6065) | 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 7) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 2) | 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 6) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 11) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 42455 a prime number?
No. 42455 = 5 × 7 × 1213, so it is divisible by 5.
What are the factors of 42455?
1, 5, 7, 35, 1213, 6065, 8491, 42455.
What is 42455 in binary?
1010010111010111 (hexadecimal A5D7, octal 122727).
What is the square root of 42455?
About 206.0461.
Is 42455 divisible by 3?
No. Its digits add up to 20, which is not a multiple of 3.
What is special about the number 42455?
42455 is a happy number: repeatedly adding the squares of its digits reaches 1.