The number 18025
18025 is a composite number with 12 divisors. Its prime factorisation is × 7 × 103. Divisors (12): 1, 5, 7, 25, 35, 103, 175, 515, 721, 2575, 3605, 18025.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 18025: a happy number: repeatedly adding the squares of its digits reaches 1.
- 2
18025 is composite. Its prime factorisation is
- 3
The divisors add up to 25792; without 18025 itself that is 7767, so 18025 is deficient (7767 is less than 18025). Euler's totient φ(18025) = 12240 numbers up to 18025 share no factor with it.
- 4
The digits of 18025 add up to 16, and repeating that until one digit is left gives the digital root 7. The Collatz sequence (halve if even, else 3n+1) takes 66 steps to reach 1.
LaTeX source of the formulas on this page
\[ 18025 = 5^{2} \times 7 \times 103 \]18025 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 12 |
| Sum of divisors | 25792 |
| Euler totient φ(n) | 12240 |
| Square | 324900625 |
| Cube | 5856333765625 |
| Square root | 134.257216 (= 5√721) |
| Digit sum / digital root | 16 / 7 |
| Collatz steps to 1 | 66 |
| Scientific notation | 1.8025 × |
18025 in other forms
| Form | Value |
|---|---|
| In words | eighteen thousand and twenty-five |
| Binary (base 2) | 100011001101001 |
| Octal (base 8) | 43151 |
| Hexadecimal (base 16) | 4669 |
| Base 3 | 220201121 |
| As time | 18025 seconds = 5 h 0 min 25 s |
Is 18025 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 (18025 ÷ 5 = 3605) | 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 | Yes (18025 ÷ 7 = 2575) | 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 7) | 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 18025 a prime number?
No. 18025 = × 7 × 103, so it is divisible by 5.
What are the factors of 18025?
1, 5, 7, 25, 35, 103, 175, 515, 721, 2575, 3605, 18025.
What is 18025 in binary?
100011001101001 (hexadecimal 4669, octal 43151).
What is the square root of 18025?
About 134.2572, exactly 5√721.
Is 18025 divisible by 3?
No. Its digits add up to 16, which is not a multiple of 3.
What is special about the number 18025?
18025 is a happy number: repeatedly adding the squares of its digits reaches 1.