The number 47999
47999 is a composite number with 4 divisors. Its prime factorisation is 7 × 6857. Divisors (4): 1, 7, 6857, 47999.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 47999: a semiprime: 7 × 6857, the product of two primes.
- 2
47999 is composite. Its prime factorisation is
- 3
The divisors add up to 54864; without 47999 itself that is 6865, so 47999 is deficient (6865 is less than 47999). Euler's totient φ(47999) = 41136 numbers up to 47999 share no factor with it.
- 4
The digits of 47999 add up to 38, and repeating that until one digit is left gives the digital root 2. The Collatz sequence (halve if even, else 3n+1) takes 96 steps to reach 1.
LaTeX source of the formulas on this page
\[ 47999 = 7 \times 6857 \]
47999 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 54864 |
| Euler totient φ(n) | 41136 |
| Square | 2303904001 |
| Cube | 110585088143999 |
| Square root | 219.086741 |
| Digit sum / digital root | 38 / 2 |
| Collatz steps to 1 | 96 |
| Scientific notation | 4.7999 × |
47999 in other forms
| Form | Value |
|---|---|
| In words | forty-seven thousand nine hundred and ninety-nine |
| Binary (base 2) | 1011101101111111 |
| Octal (base 8) | 135577 |
| Hexadecimal (base 16) | BB7F |
| Base 3 | 2102211202 |
| As time | 47999 seconds = 13 h 19 min 59 s |
Is 47999 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 (47999 ÷ 7 = 6857) | 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 6) | 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 47999 a prime number?
No. 47999 = 7 × 6857, so it is divisible by 7.
What are the factors of 47999?
1, 7, 6857, 47999.
What is 47999 in binary?
1011101101111111 (hexadecimal BB7F, octal 135577).
What is the square root of 47999?
About 219.0867.
Is 47999 divisible by 3?
No. Its digits add up to 38, which is not a multiple of 3.
What is special about the number 47999?
47999 is a semiprime: 7 × 6857, the product of two primes.