The number 15429
15429 is a composite number with 8 divisors. Its prime factorisation is 3 × 37 × 139. Divisors (8): 1, 3, 37, 111, 139, 417, 5143, 15429.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
15429 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
15429 is composite. Its prime factorisation is
- 3
The divisors add up to 21280; without 15429 itself that is 5851, so 15429 is deficient (5851 is less than 15429). Euler's totient φ(15429) = 9936 numbers up to 15429 share no factor with it.
- 4
The digits of 15429 add up to 21, and repeating that until one digit is left gives the digital root 3. The Collatz sequence (halve if even, else 3n+1) takes 53 steps to reach 1.
LaTeX source of the formulas on this page
\[ 15429 = 3 \times 37 \times 139 \]
15429 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 21280 |
| Euler totient φ(n) | 9936 |
| Square | 238054041 |
| Cube | 3672935798589 |
| Square root | 124.213526 |
| Digit sum / digital root | 21 / 3 |
| Collatz steps to 1 | 53 |
| Scientific notation | 1.5429 × |
15429 in other forms
| Form | Value |
|---|---|
| In words | fifteen thousand four hundred and twenty-nine |
| Binary (base 2) | 11110001000101 |
| Octal (base 8) | 36105 |
| Hexadecimal (base 16) | 3C45 |
| Base 3 | 210011110 |
| As time | 15429 seconds = 4 h 17 min 9 s |
Is 15429 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 | Yes (15429 ÷ 3 = 5143) | A number is divisible by 3 if the digits add up to a multiple of 3. |
| 4 | No (remainder 1) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | No (remainder 4) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 3) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 1) | 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 5) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 3) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 9) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 7) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 9) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 15429 a prime number?
No. 15429 = 3 × 37 × 139, so it is divisible by 3.
What are the factors of 15429?
1, 3, 37, 111, 139, 417, 5143, 15429.
What is 15429 in binary?
11110001000101 (hexadecimal 3C45, octal 36105).
What is the square root of 15429?
About 124.2135.
Is 15429 divisible by 3?
Yes. Its digits add up to 21, a multiple of 3.
What is special about the number 15429?
It is a composite number with 8 divisors.