The number 4387
4387 is a composite number with 4 divisors. Its prime factorisation is 41 × 107. Divisors (4): 1, 41, 107, 4387.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 4387: a semiprime: 41 × 107, the product of two primes.
- 2
4387 is composite. Its prime factorisation is
- 3
The divisors add up to 4536; without 4387 itself that is 149, so 4387 is deficient (149 is less than 4387). Euler's totient φ(4387) = 4240 numbers up to 4387 share no factor with it.
- 4
The digits of 4387 add up to 22, and repeating that until one digit is left gives the digital root 4. The Collatz sequence (halve if even, else 3n+1) takes 139 steps to reach 1.
LaTeX source of the formulas on this page
\[ 4387 = 41 \times 107 \]
4387 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 4536 |
| Euler totient φ(n) | 4240 |
| Square | 19245769 |
| Cube | 84431188603 |
| Square root | 66.234432 |
| Digit sum / digital root | 22 / 4 |
| Collatz steps to 1 | 139 |
| Scientific notation | 4.387 × |
4387 in other forms
| Form | Value |
|---|---|
| In words | four thousand three hundred and eighty-seven |
| Binary (base 2) | 1000100100011 |
| Octal (base 8) | 10443 |
| Hexadecimal (base 16) | 1123 |
| Base 3 | 20000111 |
| As time | 4387 seconds = 1 h 13 min 7 s |
Is 4387 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 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 1) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 5) | 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 4) | 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 9) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 7) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 4387 a prime number?
No. 4387 = 41 × 107, so it is divisible by 41.
What are the factors of 4387?
1, 41, 107, 4387.
What is 4387 in binary?
1000100100011 (hexadecimal 1123, octal 10443).
What is the square root of 4387?
About 66.2344.
Is 4387 divisible by 3?
No. Its digits add up to 22, which is not a multiple of 3.
What is special about the number 4387?
4387 is a semiprime: 41 × 107, the product of two primes.