The number 3979
3979 is a composite number with 4 divisors. Its prime factorisation is 23 × 173. Divisors (4): 1, 23, 173, 3979.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 3979: a semiprime: 23 × 173, the product of two primes.
- 2
3979 is composite. Its prime factorisation is
- 3
The divisors add up to 4176; without 3979 itself that is 197, so 3979 is deficient (197 is less than 3979). Euler's totient φ(3979) = 3784 numbers up to 3979 share no factor with it.
- 4
The digits of 3979 add up to 28, and repeating that until one digit is left gives the digital root 1. The Collatz sequence (halve if even, else 3n+1) takes 95 steps to reach 1.
LaTeX source of the formulas on this page
\[ 3979 = 23 \times 173 \]
3979 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 4176 |
| Euler totient φ(n) | 3784 |
| Square | 15832441 |
| Cube | 62997282739 |
| Square root | 63.079315 |
| Digit sum / digital root | 28 / 1 |
| Collatz steps to 1 | 95 |
| Scientific notation | 3.979 × |
3979 in other forms
| Form | Value |
|---|---|
| In words | three thousand nine hundred and seventy-nine |
| Roman numerals | MMMCMLXXIX |
| Binary (base 2) | 111110001011 |
| Octal (base 8) | 7613 |
| Hexadecimal (base 16) | F8B |
| Base 3 | 12110101 |
| As time | 3979 seconds = 1 h 6 min 19 s |
Is 3979 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 1) | 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 1) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 3) | 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 1) | 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 7) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 3979 a prime number?
No. 3979 = 23 × 173, so it is divisible by 23.
What are the factors of 3979?
1, 23, 173, 3979.
What is 3979 in binary?
111110001011 (hexadecimal F8B, octal 7613).
What is the square root of 3979?
About 63.0793.
What is 3979 in Roman numerals?
MMMCMLXXIX.
Is 3979 divisible by 3?
No. Its digits add up to 28, which is not a multiple of 3.
What is special about the number 3979?
3979 is a semiprime: 23 × 173, the product of two primes.