The number 799
799 is a composite number with 4 divisors. Its prime factorisation is 17 × 47. Divisors (4): 1, 17, 47, 799.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 799: a semiprime: 17 × 47, the product of two primes.
- 2
799 is composite. Its prime factorisation is
- 3
The divisors add up to 864; without 799 itself that is 65, so 799 is deficient (65 is less than 799). Euler's totient φ(799) = 736 numbers up to 799 share no factor with it.
- 4
The digits of 799 add up to 25, and repeating that until one digit is left gives the digital root 7. The Collatz sequence (halve if even, else 3n+1) takes 72 steps to reach 1.
LaTeX source of the formulas on this page
\[ 799 = 17 \times 47 \]
799 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 864 |
| Euler totient φ(n) | 736 |
| Square | 638401 |
| Cube | 510082399 |
| Square root | 28.266588 |
| Digit sum / digital root | 25 / 7 |
| Collatz steps to 1 | 72 |
| Scientific notation | 7.99 × |
799 in other forms
| Form | Value |
|---|---|
| In words | seven hundred and ninety-nine |
| Roman numerals | DCCXCIX |
| Binary (base 2) | 1100011111 |
| Octal (base 8) | 1437 |
| Hexadecimal (base 16) | 31F |
| Base 3 | 1002121 |
| As time | 799 seconds = 13 min 19 s |
Is 799 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 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 7) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 7) | 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 7) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 799 a prime number?
No. 799 = 17 × 47, so it is divisible by 17.
What are the factors of 799?
1, 17, 47, 799.
What is 799 in binary?
1100011111 (hexadecimal 31F, octal 1437).
What is the square root of 799?
About 28.2666.
What is 799 in Roman numerals?
DCCXCIX.
Is 799 divisible by 3?
No. Its digits add up to 25, which is not a multiple of 3.
What is special about the number 799?
799 is a semiprime: 17 × 47, the product of two primes.