The number 47242
47242 is a composite number with 16 divisors. Its prime factorisation is 2 × 13 × 23 × 79. Divisors (16): 1, 2, 13, 23, 26, 46, 79, 158, 299, 598, 1027, 1817, 2054, 3634, 23621, 47242.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
47242 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
47242 is composite. Its prime factorisation is
- 3
The divisors add up to 80640; without 47242 itself that is 33398, so 47242 is deficient (33398 is less than 47242). Euler's totient φ(47242) = 20592 numbers up to 47242 share no factor with it.
- 4
The digits of 47242 add up to 19, and repeating that until one digit is left gives the digital root 1. The Collatz sequence (halve if even, else 3n+1) takes 145 steps to reach 1.
LaTeX source of the formulas on this page
\[ 47242 = 2 \times 13 \times 23 \times 79 \]
47242 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 16 |
| Sum of divisors | 80640 |
| Euler totient φ(n) | 20592 |
| Square | 2231806564 |
| Cube | 105435005696488 |
| Square root | 217.352249 |
| Digit sum / digital root | 19 / 1 |
| Collatz steps to 1 | 145 |
| Scientific notation | 4.7242 × |
47242 in other forms
| Form | Value |
|---|---|
| In words | forty-seven thousand two hundred and forty-two |
| Binary (base 2) | 1011100010001010 |
| Octal (base 8) | 134212 |
| Hexadecimal (base 16) | B88A |
| Base 3 | 2101210201 |
| As time | 47242 seconds = 13 h 7 min 22 s |
Is 47242 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (47242 ÷ 2 = 23621) | 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 6) | 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 1) | 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 8) | 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 47242 a prime number?
No. 47242 = 2 × 13 × 23 × 79, so it is divisible by 2.
What are the factors of 47242?
1, 2, 13, 23, 26, 46, 79, 158, 299, 598, 1027, 1817, 2054, 3634, 23621, 47242.
What is 47242 in binary?
1011100010001010 (hexadecimal B88A, octal 134212).
What is the square root of 47242?
About 217.3522.
Is 47242 divisible by 3?
No. Its digits add up to 19, which is not a multiple of 3.
What is special about the number 47242?
It is a composite number with 16 divisors.