The number 25006
25006 is a composite number with 4 divisors. Its prime factorisation is 2 × 12503. Divisors (4): 1, 2, 12503, 25006.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 25006: a semiprime: 2 × 12503, the product of two primes.
- 2
25006 is composite. Its prime factorisation is
- 3
The divisors add up to 37512; without 25006 itself that is 12506, so 25006 is deficient (12506 is less than 25006). Euler's totient φ(25006) = 12502 numbers up to 25006 share no factor with it.
- 4
The digits of 25006 add up to 13, and repeating that until one digit is left gives the digital root 4. The Collatz sequence (halve if even, else 3n+1) takes 113 steps to reach 1.
LaTeX source of the formulas on this page
\[ 25006 = 2 \times 12503 \]
25006 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 37512 |
| Euler totient φ(n) | 12502 |
| Square | 625300036 |
| Cube | 15636252700216 |
| Square root | 158.132856 |
| Digit sum / digital root | 13 / 4 |
| Collatz steps to 1 | 113 |
| Scientific notation | 2.5006 × |
25006 in other forms
| Form | Value |
|---|---|
| In words | twenty-five thousand and six |
| Binary (base 2) | 110000110101110 |
| Octal (base 8) | 60656 |
| Hexadecimal (base 16) | 61AE |
| Base 3 | 1021022011 |
| As time | 25006 seconds = 6 h 56 min 46 s |
Is 25006 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (25006 ÷ 2 = 12503) | 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 | No (remainder 1) | 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 2) | 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 6) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 4) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 6) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 3) | 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 25006 a prime number?
No. 25006 = 2 × 12503, so it is divisible by 2.
What are the factors of 25006?
1, 2, 12503, 25006.
What is 25006 in binary?
110000110101110 (hexadecimal 61AE, octal 60656).
What is the square root of 25006?
About 158.1329.
Is 25006 divisible by 3?
No. Its digits add up to 13, which is not a multiple of 3.
What is special about the number 25006?
25006 is a semiprime: 2 × 12503, the product of two primes.