The number 13439
13439 is a composite number with 4 divisors. Its prime factorisation is 89 × 151. Divisors (4): 1, 89, 151, 13439.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 13439: a semiprime: 89 × 151, the product of two primes.
- 2
13439 is composite. Its prime factorisation is
- 3
The divisors add up to 13680; without 13439 itself that is 241, so 13439 is deficient (241 is less than 13439). Euler's totient φ(13439) = 13200 numbers up to 13439 share no factor with it.
- 4
The digits of 13439 add up to 20, and repeating that until one digit is left gives the digital root 2. The Collatz sequence (halve if even, else 3n+1) takes 244 steps to reach 1.
LaTeX source of the formulas on this page
\[ 13439 = 89 \times 151 \]
13439 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 13680 |
| Euler totient φ(n) | 13200 |
| Square | 180606721 |
| Cube | 2427173723519 |
| Square root | 115.926701 |
| Digit sum / digital root | 20 / 2 |
| Collatz steps to 1 | 244 |
| Scientific notation | 1.3439 × |
13439 in other forms
| Form | Value |
|---|---|
| In words | thirteen thousand four hundred and thirty-nine |
| Binary (base 2) | 11010001111111 |
| Octal (base 8) | 32177 |
| Hexadecimal (base 16) | 347F |
| Base 3 | 200102202 |
| As time | 13439 seconds = 3 h 43 min 59 s |
Is 13439 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 2) | 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 4) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 5) | 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 7) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 2) | 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 8) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 11) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 13439 a prime number?
No. 13439 = 89 × 151, so it is divisible by 89.
What are the factors of 13439?
1, 89, 151, 13439.
What is 13439 in binary?
11010001111111 (hexadecimal 347F, octal 32177).
What is the square root of 13439?
About 115.9267.
Is 13439 divisible by 3?
No. Its digits add up to 20, which is not a multiple of 3.
What is special about the number 13439?
13439 is a semiprime: 89 × 151, the product of two primes.