The number 13979
13979 is a composite number with 4 divisors. Its prime factorisation is 7 × 1997. Divisors (4): 1, 7, 1997, 13979.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 13979: a semiprime: 7 × 1997, the product of two primes.
- 2
13979 is composite. Its prime factorisation is
- 3
The divisors add up to 15984; without 13979 itself that is 2005, so 13979 is deficient (2005 is less than 13979). Euler's totient φ(13979) = 11976 numbers up to 13979 share no factor with it.
- 4
The digits of 13979 add up to 29, and repeating that until one digit is left gives the digital root 2. The Collatz sequence (halve if even, else 3n+1) takes 89 steps to reach 1.
LaTeX source of the formulas on this page
\[ 13979 = 7 \times 1997 \]
13979 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 15984 |
| Euler totient φ(n) | 11976 |
| Square | 195412441 |
| Cube | 2731670512739 |
| Square root | 118.232821 |
| Digit sum / digital root | 29 / 2 |
| Collatz steps to 1 | 89 |
| Scientific notation | 1.3979 × |
13979 in other forms
| Form | Value |
|---|---|
| In words | thirteen thousand nine hundred and seventy-nine |
| Binary (base 2) | 11011010011011 |
| Octal (base 8) | 33233 |
| Hexadecimal (base 16) | 369B |
| Base 3 | 201011202 |
| As time | 13979 seconds = 3 h 52 min 59 s |
Is 13979 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 | Yes (13979 ÷ 7 = 1997) | 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 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 9) | 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 13979 a prime number?
No. 13979 = 7 × 1997, so it is divisible by 7.
What are the factors of 13979?
1, 7, 1997, 13979.
What is 13979 in binary?
11011010011011 (hexadecimal 369B, octal 33233).
What is the square root of 13979?
About 118.2328.
Is 13979 divisible by 3?
No. Its digits add up to 29, which is not a multiple of 3.
What is special about the number 13979?
13979 is a semiprime: 7 × 1997, the product of two primes.