The number 47122
47122 is a composite number with 4 divisors. Its prime factorisation is 2 × 23561. Divisors (4): 1, 2, 23561, 47122.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 47122: a semiprime: 2 × 23561, the product of two primes.
- 2
47122 is composite. Its prime factorisation is
- 3
The divisors add up to 70686; without 47122 itself that is 23564, so 47122 is deficient (23564 is less than 47122). Euler's totient φ(47122) = 23560 numbers up to 47122 share no factor with it.
- 4
The digits of 47122 add up to 16, and repeating that until one digit is left gives the digital root 7. The Collatz sequence (halve if even, else 3n+1) takes 83 steps to reach 1.
LaTeX source of the formulas on this page
\[ 47122 = 2 \times 23561 \]
47122 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 70686 |
| Euler totient φ(n) | 23560 |
| Square | 2220482884 |
| Cube | 104633594459848 |
| Square root | 217.076024 |
| Digit sum / digital root | 16 / 7 |
| Collatz steps to 1 | 83 |
| Scientific notation | 4.7122 × |
47122 in other forms
| Form | Value |
|---|---|
| In words | forty-seven thousand one hundred and twenty-two |
| Binary (base 2) | 1011100000010010 |
| Octal (base 8) | 134022 |
| Hexadecimal (base 16) | B812 |
| Base 3 | 2101122021 |
| As time | 47122 seconds = 13 h 5 min 22 s |
Is 47122 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (47122 ÷ 2 = 23561) | 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 2) | 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 4) | 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 2) | 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 2) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 9) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 10) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 47122 a prime number?
No. 47122 = 2 × 23561, so it is divisible by 2.
What are the factors of 47122?
1, 2, 23561, 47122.
What is 47122 in binary?
1011100000010010 (hexadecimal B812, octal 134022).
What is the square root of 47122?
About 217.0760.
Is 47122 divisible by 3?
No. Its digits add up to 16, which is not a multiple of 3.
What is special about the number 47122?
47122 is a semiprime: 2 × 23561, the product of two primes.