The number 47887
47887 is a composite number with 4 divisors. Its prime factorisation is 7 × 6841. Divisors (4): 1, 7, 6841, 47887.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 47887: a semiprime: 7 × 6841, the product of two primes.
- 2
47887 is composite. Its prime factorisation is
- 3
The divisors add up to 54736; without 47887 itself that is 6849, so 47887 is deficient (6849 is less than 47887). Euler's totient φ(47887) = 41040 numbers up to 47887 share no factor with it.
- 4
The digits of 47887 add up to 34, and repeating that until one digit is left gives the digital root 7. The Collatz sequence (halve if even, else 3n+1) takes 52 steps to reach 1.
LaTeX source of the formulas on this page
\[ 47887 = 7 \times 6841 \]
47887 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 54736 |
| Euler totient φ(n) | 41040 |
| Square | 2293164769 |
| Cube | 109812781293103 |
| Square root | 218.830985 |
| Digit sum / digital root | 34 / 7 |
| Collatz steps to 1 | 52 |
| Scientific notation | 4.7887 × |
47887 in other forms
| Form | Value |
|---|---|
| In words | forty-seven thousand eight hundred and eighty-seven |
| Binary (base 2) | 1011101100001111 |
| Octal (base 8) | 135417 |
| Hexadecimal (base 16) | BB0F |
| Base 3 | 2102200121 |
| As time | 47887 seconds = 13 h 18 min 7 s |
Is 47887 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 2) | 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 | Yes (47887 ÷ 7 = 6841) | 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 7) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 4) | 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 47887 a prime number?
No. 47887 = 7 × 6841, so it is divisible by 7.
What are the factors of 47887?
1, 7, 6841, 47887.
What is 47887 in binary?
1011101100001111 (hexadecimal BB0F, octal 135417).
What is the square root of 47887?
About 218.8310.
Is 47887 divisible by 3?
No. Its digits add up to 34, which is not a multiple of 3.
What is special about the number 47887?
47887 is a semiprime: 7 × 6841, the product of two primes.