The number 2487
2487 is a composite number with 4 divisors. Its prime factorisation is 3 × 829. Divisors (4): 1, 3, 829, 2487.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 2487: a happy number: repeatedly adding the squares of its digits reaches 1; a semiprime: 3 × 829, the product of two primes.
- 2
2487 is composite. Its prime factorisation is
- 3
The divisors add up to 3320; without 2487 itself that is 833, so 2487 is deficient (833 is less than 2487). Euler's totient φ(2487) = 1656 numbers up to 2487 share no factor with it.
- 4
The digits of 2487 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 71 steps to reach 1.
LaTeX source of the formulas on this page
\[ 2487 = 3 \times 829 \]
2487 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 3320 |
| Euler totient φ(n) | 1656 |
| Square | 6185169 |
| Cube | 15382515303 |
| Square root | 49.869831 |
| Digit sum / digital root | 21 / 3 |
| Collatz steps to 1 | 71 |
| Scientific notation | 2.487 × |
2487 in other forms
| Form | Value |
|---|---|
| In words | two thousand four hundred and eighty-seven |
| Roman numerals | MMCDLXXXVII |
| Binary (base 2) | 100110110111 |
| Octal (base 8) | 4667 |
| Hexadecimal (base 16) | 9B7 |
| Base 3 | 10102010 |
| As time | 2487 seconds = 41 min 27 s |
Is 2487 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 (2487 ÷ 3 = 829) | 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 1) | 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 2487 a prime number?
No. 2487 = 3 × 829, so it is divisible by 3.
What are the factors of 2487?
1, 3, 829, 2487.
What is 2487 in binary?
100110110111 (hexadecimal 9B7, octal 4667).
What is the square root of 2487?
About 49.8698.
What is 2487 in Roman numerals?
MMCDLXXXVII.
Is 2487 divisible by 3?
Yes. Its digits add up to 21, a multiple of 3.
What is special about the number 2487?
2487 is a happy number: repeatedly adding the squares of its digits reaches 1; a semiprime: 3 × 829, the product of two primes.