The number 23979
23979 is a composite number with 4 divisors. Its prime factorisation is 3 × 7993. Divisors (4): 1, 3, 7993, 23979.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 23979: a semiprime: 3 × 7993, the product of two primes.
- 2
23979 is composite. Its prime factorisation is
- 3
The divisors add up to 31976; without 23979 itself that is 7997, so 23979 is deficient (7997 is less than 23979). Euler's totient φ(23979) = 15984 numbers up to 23979 share no factor with it.
- 4
The digits of 23979 add up to 30, and repeating that until one digit is left gives the digital root 3. The Collatz sequence (halve if even, else 3n+1) takes 219 steps to reach 1.
LaTeX source of the formulas on this page
\[ 23979 = 3 \times 7993 \]
23979 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 31976 |
| Euler totient φ(n) | 15984 |
| Square | 574992441 |
| Cube | 13787743742739 |
| Square root | 154.851542 |
| Digit sum / digital root | 30 / 3 |
| Collatz steps to 1 | 219 |
| Scientific notation | 2.3979 × |
23979 in other forms
| Form | Value |
|---|---|
| In words | twenty-three thousand nine hundred and seventy-nine |
| Binary (base 2) | 101110110101011 |
| Octal (base 8) | 56653 |
| Hexadecimal (base 16) | 5DAB |
| Base 3 | 1012220010 |
| As time | 23979 seconds = 6 h 39 min 39 s |
Is 23979 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 (23979 ÷ 3 = 7993) | 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 3) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 4) | 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 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 10) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 3) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 23979 a prime number?
No. 23979 = 3 × 7993, so it is divisible by 3.
What are the factors of 23979?
1, 3, 7993, 23979.
What is 23979 in binary?
101110110101011 (hexadecimal 5DAB, octal 56653).
What is the square root of 23979?
About 154.8515.
Is 23979 divisible by 3?
Yes. Its digits add up to 30, a multiple of 3.
What is special about the number 23979?
23979 is a semiprime: 3 × 7993, the product of two primes.