The number 24985
24985 is a composite number with 8 divisors. Its prime factorisation is 5 × 19 × 263. Divisors (8): 1, 5, 19, 95, 263, 1315, 4997, 24985.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 24985: a happy number: repeatedly adding the squares of its digits reaches 1.
- 2
24985 is composite. Its prime factorisation is
- 3
The divisors add up to 31680; without 24985 itself that is 6695, so 24985 is deficient (6695 is less than 24985). Euler's totient φ(24985) = 18864 numbers up to 24985 share no factor with it.
- 4
The digits of 24985 add up to 28, and repeating that until one digit is left gives the digital root 1. The Collatz sequence (halve if even, else 3n+1) takes 64 steps to reach 1.
LaTeX source of the formulas on this page
\[ 24985 = 5 \times 19 \times 263 \]
24985 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 31680 |
| Euler totient φ(n) | 18864 |
| Square | 624250225 |
| Cube | 15596891871625 |
| Square root | 158.066442 |
| Digit sum / digital root | 28 / 1 |
| Collatz steps to 1 | 64 |
| Scientific notation | 2.4985 × |
24985 in other forms
| Form | Value |
|---|---|
| In words | twenty-four thousand nine hundred and eighty-five |
| Binary (base 2) | 110000110011001 |
| Octal (base 8) | 60631 |
| Hexadecimal (base 16) | 6199 |
| Base 3 | 1021021101 |
| As time | 24985 seconds = 6 h 56 min 25 s |
Is 24985 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 (24985 ÷ 5 = 4997) | 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 | 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 1) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 1) | 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 4) | 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 24985 a prime number?
No. 24985 = 5 × 19 × 263, so it is divisible by 5.
What are the factors of 24985?
1, 5, 19, 95, 263, 1315, 4997, 24985.
What is 24985 in binary?
110000110011001 (hexadecimal 6199, octal 60631).
What is the square root of 24985?
About 158.0664.
Is 24985 divisible by 3?
No. Its digits add up to 28, which is not a multiple of 3.
What is special about the number 24985?
24985 is a happy number: repeatedly adding the squares of its digits reaches 1.