The number 47438
47438 is a composite number with 4 divisors. Its prime factorisation is 2 × 23719. Divisors (4): 1, 2, 23719, 47438.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 47438: a semiprime: 2 × 23719, the product of two primes.
- 2
47438 is composite. Its prime factorisation is
- 3
The divisors add up to 71160; without 47438 itself that is 23722, so 47438 is deficient (23722 is less than 47438). Euler's totient φ(47438) = 23718 numbers up to 47438 share no factor with it.
- 4
The digits of 47438 add up to 26, and repeating that until one digit is left gives the digital root 8. The Collatz sequence (halve if even, else 3n+1) takes 83 steps to reach 1.
LaTeX source of the formulas on this page
\[ 47438 = 2 \times 23719 \]
47438 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 71160 |
| Euler totient φ(n) | 23718 |
| Square | 2250363844 |
| Cube | 106752760031672 |
| Square root | 217.802663 |
| Digit sum / digital root | 26 / 8 |
| Collatz steps to 1 | 83 |
| Scientific notation | 4.7438 × |
47438 in other forms
| Form | Value |
|---|---|
| In words | forty-seven thousand four hundred and thirty-eight |
| Binary (base 2) | 1011100101001110 |
| Octal (base 8) | 134516 |
| Hexadecimal (base 16) | B94E |
| Base 3 | 2102001222 |
| As time | 47438 seconds = 13 h 10 min 38 s |
Is 47438 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (47438 ÷ 2 = 23719) | 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 | No (remainder 3) | 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 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 6) | 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 8) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 6) | 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 47438 a prime number?
No. 47438 = 2 × 23719, so it is divisible by 2.
What are the factors of 47438?
1, 2, 23719, 47438.
What is 47438 in binary?
1011100101001110 (hexadecimal B94E, octal 134516).
What is the square root of 47438?
About 217.8027.
Is 47438 divisible by 3?
No. Its digits add up to 26, which is not a multiple of 3.
What is special about the number 47438?
47438 is a semiprime: 2 × 23719, the product of two primes.