The number 55387
55387 is a composite number with 4 divisors. Its prime factorisation is 97 × 571. Divisors (4): 1, 97, 571, 55387.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 55387: a semiprime: 97 × 571, the product of two primes.
- 2
55387 is composite. Its prime factorisation is
- 3
The divisors add up to 56056; without 55387 itself that is 669, so 55387 is deficient (669 is less than 55387). Euler's totient φ(55387) = 54720 numbers up to 55387 share no factor with it.
- 4
The digits of 55387 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 228 steps to reach 1.
LaTeX source of the formulas on this page
\[ 55387 = 97 \times 571 \]
55387 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 56056 |
| Euler totient φ(n) | 54720 |
| Square | 3067719769 |
| Cube | 169911794845603 |
| Square root | 235.344428 |
| Digit sum / digital root | 28 / 1 |
| Collatz steps to 1 | 228 |
| Scientific notation | 5.5387 × |
55387 in other forms
| Form | Value |
|---|---|
| In words | fifty-five thousand three hundred and eighty-seven |
| Binary (base 2) | 1101100001011011 |
| Octal (base 8) | 154133 |
| Hexadecimal (base 16) | D85B |
| Base 3 | 2210222101 |
| As time | 55387 seconds = 15 h 23 min 7 s |
Is 55387 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 3) | 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 1) | 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 2) | 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 55387 a prime number?
No. 55387 = 97 × 571, so it is divisible by 97.
What are the factors of 55387?
1, 97, 571, 55387.
What is 55387 in binary?
1101100001011011 (hexadecimal D85B, octal 154133).
What is the square root of 55387?
About 235.3444.
Is 55387 divisible by 3?
No. Its digits add up to 28, which is not a multiple of 3.
What is special about the number 55387?
55387 is a semiprime: 97 × 571, the product of two primes.