The number 425
425 is a composite number with 6 divisors. Its prime factorisation is Ć 17. Divisors (6): 1, 5, 17, 25, 85, 425.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
425 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
425 is composite. Its prime factorisation is
- 3
The divisors add up to 558; without 425 itself that is 133, so 425 is deficient (133 is less than 425). Euler's totient Ļ(425) = 320 numbers up to 425 share no factor with it.
- 4
The digits of 425 add up to 11, and repeating that until one digit is left gives the digital root 2. The Collatz sequence (halve if even, else 3n+1) takes 58 steps to reach 1.
LaTeX source of the formulas on this page
\[ 425 = 5^{2} \times 17 \]425 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 6 |
| Sum of divisors | 558 |
| Euler totient Ļ(n) | 320 |
| Square | 180625 |
| Cube | 76765625 |
| Square root | 20.615528 (= 5ā17) |
| Digit sum / digital root | 11 / 2 |
| Collatz steps to 1 | 58 |
| Scientific notation | 4.25 Ć |
425 in other forms
| Form | Value |
|---|---|
| In words | four hundred and twenty-five |
| Roman numerals | CDXXV |
| Binary (base 2) | 110101001 |
| Octal (base 8) | 651 |
| Hexadecimal (base 16) | 1A9 |
| Base 3 | 120202 |
| As time | 425 seconds = 7 min 5 s |
Is 425 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 | Yes (425 Ć· 5 = 85) | 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 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 1) | 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 7) | 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 425 a prime number?
No. 425 = Ć 17, so it is divisible by 5.
What are the factors of 425?
1, 5, 17, 25, 85, 425.
What is 425 in binary?
110101001 (hexadecimal 1A9, octal 651).
What is the square root of 425?
About 20.6155, exactly 5ā17.
What is 425 in Roman numerals?
CDXXV.
Is 425 divisible by 3?
No. Its digits add up to 11, which is not a multiple of 3.
What is special about the number 425?
It is a composite number with 6 divisors.