The number 15087
15087 is a composite number with 8 divisors. Its prime factorisation is 3 × 47 × 107. Divisors (8): 1, 3, 47, 107, 141, 321, 5029, 15087.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 15087: a happy number: repeatedly adding the squares of its digits reaches 1.
- 2
15087 is composite. Its prime factorisation is
- 3
The divisors add up to 20736; without 15087 itself that is 5649, so 15087 is deficient (5649 is less than 15087). Euler's totient φ(15087) = 9752 numbers up to 15087 share no factor with it.
- 4
The digits of 15087 add up to 21, and repeating that until one digit is left gives the digital root 3. The Collatz sequence (halve if even, else 3n+1) takes 208 steps to reach 1.
LaTeX source of the formulas on this page
\[ 15087 = 3 \times 47 \times 107 \]
15087 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 20736 |
| Euler totient φ(n) | 9752 |
| Square | 227617569 |
| Cube | 3434066263503 |
| Square root | 122.829150 |
| Digit sum / digital root | 21 / 3 |
| Collatz steps to 1 | 208 |
| Scientific notation | 1.5087 × |
15087 in other forms
| Form | Value |
|---|---|
| In words | fifteen thousand and eighty-seven |
| Binary (base 2) | 11101011101111 |
| Octal (base 8) | 35357 |
| Hexadecimal (base 16) | 3AEF |
| Base 3 | 202200210 |
| As time | 15087 seconds = 4 h 11 min 27 s |
Is 15087 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 | Yes (15087 ÷ 3 = 5029) | A number is divisible by 3 if the digits add up to a multiple of 3. |
| 4 | No (remainder 3) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | No (remainder 2) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 3) | 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 7) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 3) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 7) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 6) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 3) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 15087 a prime number?
No. 15087 = 3 × 47 × 107, so it is divisible by 3.
What are the factors of 15087?
1, 3, 47, 107, 141, 321, 5029, 15087.
What is 15087 in binary?
11101011101111 (hexadecimal 3AEF, octal 35357).
What is the square root of 15087?
About 122.8291.
Is 15087 divisible by 3?
Yes. Its digits add up to 21, a multiple of 3.
What is special about the number 15087?
15087 is a happy number: repeatedly adding the squares of its digits reaches 1.