The number 18425
18425 is a composite number with 12 divisors. Its prime factorisation is × 11 × 67. Divisors (12): 1, 5, 11, 25, 55, 67, 275, 335, 737, 1675, 3685, 18425.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
18425 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
18425 is composite. Its prime factorisation is
- 3
The divisors add up to 25296; without 18425 itself that is 6871, so 18425 is deficient (6871 is less than 18425). Euler's totient φ(18425) = 13200 numbers up to 18425 share no factor with it.
- 4
The digits of 18425 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 66 steps to reach 1.
LaTeX source of the formulas on this page
\[ 18425 = 5^{2} \times 11 \times 67 \]18425 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 12 |
| Sum of divisors | 25296 |
| Euler totient φ(n) | 13200 |
| Square | 339480625 |
| Cube | 6254930515625 |
| Square root | 135.738720 (= 5√737) |
| Digit sum / digital root | 20 / 2 |
| Collatz steps to 1 | 66 |
| Scientific notation | 1.8425 × |
18425 in other forms
| Form | Value |
|---|---|
| In words | eighteen thousand four hundred and twenty-five |
| Binary (base 2) | 100011111111001 |
| Octal (base 8) | 43771 |
| Hexadecimal (base 16) | 47F9 |
| Base 3 | 221021102 |
| As time | 18425 seconds = 5 h 7 min 5 s |
Is 18425 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 (18425 ÷ 5 = 3685) | 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 1) | 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 | Yes (18425 ÷ 11 = 1675) | 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 18425 a prime number?
No. 18425 = × 11 × 67, so it is divisible by 5.
What are the factors of 18425?
1, 5, 11, 25, 55, 67, 275, 335, 737, 1675, 3685, 18425.
What is 18425 in binary?
100011111111001 (hexadecimal 47F9, octal 43771).
What is the square root of 18425?
About 135.7387, exactly 5√737.
Is 18425 divisible by 3?
No. Its digits add up to 20, which is not a multiple of 3.
What is special about the number 18425?
It is a composite number with 12 divisors.