The number 47789
47789 is a composite number with 4 divisors. Its prime factorisation is 7 × 6827. Divisors (4): 1, 7, 6827, 47789.
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How to work it out
- 1
What is special about 47789: a semiprime: 7 × 6827, the product of two primes.
- 2
47789 is composite. Its prime factorisation is
- 3
The divisors add up to 54624; without 47789 itself that is 6835, so 47789 is deficient (6835 is less than 47789). Euler's totient φ(47789) = 40956 numbers up to 47789 share no factor with it.
- 4
The digits of 47789 add up to 35, and repeating that until one digit is left gives the digital root 8. The Collatz sequence (halve if even, else 3n+1) takes 96 steps to reach 1.
LaTeX source of the formulas on this page
\[ 47789 = 7 \times 6827 \]
47789 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 54624 |
| Euler totient φ(n) | 40956 |
| Square | 2283788521 |
| Cube | 109139969630069 |
| Square root | 218.606953 |
| Digit sum / digital root | 35 / 8 |
| Collatz steps to 1 | 96 |
| Scientific notation | 4.7789 × |
47789 in other forms
| Form | Value |
|---|---|
| In words | forty-seven thousand seven hundred and eighty-nine |
| Binary (base 2) | 1011101010101101 |
| Octal (base 8) | 135255 |
| Hexadecimal (base 16) | BAAD |
| Base 3 | 2102112222 |
| As time | 47789 seconds = 13 h 16 min 29 s |
Is 47789 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 1) | 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 (47789 ÷ 7 = 6827) | 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 5) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 8) | 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 5) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 5) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 47789 a prime number?
No. 47789 = 7 × 6827, so it is divisible by 7.
What are the factors of 47789?
1, 7, 6827, 47789.
What is 47789 in binary?
1011101010101101 (hexadecimal BAAD, octal 135255).
What is the square root of 47789?
About 218.6070.
Is 47789 divisible by 3?
No. Its digits add up to 35, which is not a multiple of 3.
What is special about the number 47789?
47789 is a semiprime: 7 × 6827, the product of two primes.