The number 25450
25450 is a composite number with 12 divisors. Its prime factorisation is 2 × × 509. Divisors (12): 1, 2, 5, 10, 25, 50, 509, 1018, 2545, 5090, 12725, 25450.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 25450: a happy number: repeatedly adding the squares of its digits reaches 1.
- 2
25450 is composite. Its prime factorisation is
- 3
The divisors add up to 47430; without 25450 itself that is 21980, so 25450 is deficient (21980 is less than 25450). Euler's totient φ(25450) = 10160 numbers up to 25450 share no factor with it.
- 4
The digits of 25450 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 108 steps to reach 1.
LaTeX source of the formulas on this page
\[ 25450 = 2 \times 5^{2} \times 509 \]25450 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 12 |
| Sum of divisors | 47430 |
| Euler totient φ(n) | 10160 |
| Square | 647702500 |
| Cube | 16484028625000 |
| Square root | 159.530561 (= 5√1018) |
| Digit sum / digital root | 16 / 7 |
| Collatz steps to 1 | 108 |
| Scientific notation | 2.545 × |
25450 in other forms
| Form | Value |
|---|---|
| In words | twenty-five thousand four hundred and fifty |
| Binary (base 2) | 110001101101010 |
| Octal (base 8) | 61552 |
| Hexadecimal (base 16) | 636A |
| Base 3 | 1021220121 |
| As time | 25450 seconds = 7 h 4 min 10 s |
Is 25450 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (25450 ÷ 2 = 12725) | 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 2) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | Yes (25450 ÷ 5 = 5090) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 4) | 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 2) | 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 | Yes (25450 ÷ 10 = 2545) | 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 10) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 25450 a prime number?
No. 25450 = 2 × × 509, so it is divisible by 2.
What are the factors of 25450?
1, 2, 5, 10, 25, 50, 509, 1018, 2545, 5090, 12725, 25450.
What is 25450 in binary?
110001101101010 (hexadecimal 636A, octal 61552).
What is the square root of 25450?
About 159.5306, exactly 5√1018.
Is 25450 divisible by 3?
No. Its digits add up to 16, which is not a multiple of 3.
What is special about the number 25450?
25450 is a happy number: repeatedly adding the squares of its digits reaches 1.