The number 15388
15388 is a composite number with 6 divisors. Its prime factorisation is × 3847. Divisors (6): 1, 2, 4, 3847, 7694, 15388.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
15388 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
15388 is composite. Its prime factorisation is
- 3
The divisors add up to 26936; without 15388 itself that is 11548, so 15388 is deficient (11548 is less than 15388). Euler's totient φ(15388) = 7692 numbers up to 15388 share no factor with it.
- 4
The digits of 15388 add up to 25, and repeating that until one digit is left gives the digital root 7. The Collatz sequence (halve if even, else 3n+1) takes 146 steps to reach 1.
LaTeX source of the formulas on this page
\[ 15388 = 2^{2} \times 3847 \]15388 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 6 |
| Sum of divisors | 26936 |
| Euler totient φ(n) | 7692 |
| Square | 236790544 |
| Cube | 3643732891072 |
| Square root | 124.048378 (= 2√3847) |
| Digit sum / digital root | 25 / 7 |
| Collatz steps to 1 | 146 |
| Scientific notation | 1.5388 × |
15388 in other forms
| Form | Value |
|---|---|
| In words | fifteen thousand three hundred and eighty-eight |
| Binary (base 2) | 11110000011100 |
| Octal (base 8) | 36034 |
| Hexadecimal (base 16) | 3C1C |
| Base 3 | 210002221 |
| As time | 15388 seconds = 4 h 16 min 28 s |
Is 15388 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (15388 ÷ 2 = 7694) | 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 | Yes (15388 ÷ 4 = 3847) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | No (remainder 3) | 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 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 4) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 7) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 8) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 10) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 4) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 15388 a prime number?
No. 15388 = × 3847, so it is divisible by 2.
What are the factors of 15388?
1, 2, 4, 3847, 7694, 15388.
What is 15388 in binary?
11110000011100 (hexadecimal 3C1C, octal 36034).
What is the square root of 15388?
About 124.0484, exactly 2√3847.
Is 15388 divisible by 3?
No. Its digits add up to 25, which is not a multiple of 3.
What is special about the number 15388?
It is a composite number with 6 divisors.