The number 14987
14987 is a composite number with 4 divisors. Its prime factorisation is 7 × 2141. Divisors (4): 1, 7, 2141, 14987.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 14987: a semiprime: 7 × 2141, the product of two primes.
- 2
14987 is composite. Its prime factorisation is
- 3
The divisors add up to 17136; without 14987 itself that is 2149, so 14987 is deficient (2149 is less than 14987). Euler's totient φ(14987) = 12840 numbers up to 14987 share no factor with it.
- 4
The digits of 14987 add up to 29, and repeating that until one digit is left gives the digital root 2. The Collatz sequence (halve if even, else 3n+1) takes 164 steps to reach 1.
LaTeX source of the formulas on this page
\[ 14987 = 7 \times 2141 \]
14987 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 17136 |
| Euler totient φ(n) | 12840 |
| Square | 224610169 |
| Cube | 3366232602803 |
| Square root | 122.421403 |
| Digit sum / digital root | 29 / 2 |
| Collatz steps to 1 | 164 |
| Scientific notation | 1.4987 × |
14987 in other forms
| Form | Value |
|---|---|
| In words | fourteen thousand nine hundred and eighty-seven |
| Binary (base 2) | 11101010001011 |
| Octal (base 8) | 35213 |
| Hexadecimal (base 16) | 3A8B |
| Base 3 | 202120002 |
| As time | 14987 seconds = 4 h 9 min 47 s |
Is 14987 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 2) | 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 5) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | Yes (14987 ÷ 7 = 2141) | 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 3) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 2) | 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 5) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 11) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 14987 a prime number?
No. 14987 = 7 × 2141, so it is divisible by 7.
What are the factors of 14987?
1, 7, 2141, 14987.
What is 14987 in binary?
11101010001011 (hexadecimal 3A8B, octal 35213).
What is the square root of 14987?
About 122.4214.
Is 14987 divisible by 3?
No. Its digits add up to 29, which is not a multiple of 3.
What is special about the number 14987?
14987 is a semiprime: 7 × 2141, the product of two primes.