The number 47990
47990 is a composite number with 8 divisors. Its prime factorisation is 2 × 5 × 4799. Divisors (8): 1, 2, 5, 10, 4799, 9598, 23995, 47990.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
47990 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
47990 is composite. Its prime factorisation is
- 3
The divisors add up to 86400; without 47990 itself that is 38410, so 47990 is deficient (38410 is less than 47990). Euler's totient φ(47990) = 19192 numbers up to 47990 share no factor with it.
- 4
The digits of 47990 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 189 steps to reach 1.
LaTeX source of the formulas on this page
\[ 47990 = 2 \times 5 \times 4799 \]
47990 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 86400 |
| Euler totient φ(n) | 19192 |
| Square | 2303040100 |
| Cube | 110522894399000 |
| Square root | 219.066200 |
| Digit sum / digital root | 29 / 2 |
| Collatz steps to 1 | 189 |
| Scientific notation | 4.799 × |
47990 in other forms
| Form | Value |
|---|---|
| In words | forty-seven thousand nine hundred and ninety |
| Binary (base 2) | 1011101101110110 |
| Octal (base 8) | 135566 |
| Hexadecimal (base 16) | BB76 |
| Base 3 | 2102211102 |
| As time | 47990 seconds = 13 h 19 min 50 s |
Is 47990 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (47990 ÷ 2 = 23995) | 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 2) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | Yes (47990 ÷ 5 = 9598) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 2) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 5) | 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 6) | 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 | Yes (47990 ÷ 10 = 4799) | 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 2) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 47990 a prime number?
No. 47990 = 2 × 5 × 4799, so it is divisible by 2.
What are the factors of 47990?
1, 2, 5, 10, 4799, 9598, 23995, 47990.
What is 47990 in binary?
1011101101110110 (hexadecimal BB76, octal 135566).
What is the square root of 47990?
About 219.0662.
Is 47990 divisible by 3?
No. Its digits add up to 29, which is not a multiple of 3.
What is special about the number 47990?
It is a composite number with 8 divisors.