The number 55390
55390 is a composite number with 16 divisors. Its prime factorisation is 2 × 5 × 29 × 191. Divisors (16): 1, 2, 5, 10, 29, 58, 145, 191, 290, 382, 955, 1910, 5539, 11078, 27695, 55390.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
55390 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
55390 is composite. Its prime factorisation is
- 3
The divisors add up to 103680; without 55390 itself that is 48290, so 55390 is deficient (48290 is less than 55390). Euler's totient φ(55390) = 21280 numbers up to 55390 share no factor with it.
- 4
The digits of 55390 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 60 steps to reach 1.
LaTeX source of the formulas on this page
\[ 55390 = 2 \times 5 \times 29 \times 191 \]
55390 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 16 |
| Sum of divisors | 103680 |
| Euler totient φ(n) | 21280 |
| Square | 3068052100 |
| Cube | 169939405819000 |
| Square root | 235.350802 |
| Digit sum / digital root | 22 / 4 |
| Collatz steps to 1 | 60 |
| Scientific notation | 5.539 × |
55390 in other forms
| Form | Value |
|---|---|
| In words | fifty-five thousand three hundred and ninety |
| Binary (base 2) | 1101100001011110 |
| Octal (base 8) | 154136 |
| Hexadecimal (base 16) | D85E |
| Base 3 | 2210222111 |
| As time | 55390 seconds = 15 h 23 min 10 s |
Is 55390 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (55390 ÷ 2 = 27695) | 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 2) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | Yes (55390 ÷ 5 = 11078) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 4) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 6) | 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 6) | 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 | Yes (55390 ÷ 10 = 5539) | 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 10) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 55390 a prime number?
No. 55390 = 2 × 5 × 29 × 191, so it is divisible by 2.
What are the factors of 55390?
1, 2, 5, 10, 29, 58, 145, 191, 290, 382, 955, 1910, 5539, 11078, 27695, 55390.
What is 55390 in binary?
1101100001011110 (hexadecimal D85E, octal 154136).
What is the square root of 55390?
About 235.3508.
Is 55390 divisible by 3?
No. Its digits add up to 22, which is not a multiple of 3.
What is special about the number 55390?
It is a composite number with 16 divisors.