The number 47423
47423 is a composite number with 4 divisors. Its prime factorisation is 47 × 1009. Divisors (4): 1, 47, 1009, 47423.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 47423: a happy number: repeatedly adding the squares of its digits reaches 1; a semiprime: 47 × 1009, the product of two primes.
- 2
47423 is composite. Its prime factorisation is
- 3
The divisors add up to 48480; without 47423 itself that is 1057, so 47423 is deficient (1057 is less than 47423). Euler's totient φ(47423) = 46368 numbers up to 47423 share no factor with it.
- 4
The digits of 47423 add up to 20, and repeating that until one digit is left gives the digital root 2. The Collatz sequence (halve if even, else 3n+1) takes 176 steps to reach 1.
LaTeX source of the formulas on this page
\[ 47423 = 47 \times 1009 \]
47423 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 48480 |
| Euler totient φ(n) | 46368 |
| Square | 2248940929 |
| Cube | 106651525675967 |
| Square root | 217.768225 |
| Digit sum / digital root | 20 / 2 |
| Collatz steps to 1 | 176 |
| Scientific notation | 4.7423 × |
47423 in other forms
| Form | Value |
|---|---|
| In words | forty-seven thousand four hundred and twenty-three |
| Binary (base 2) | 1011100100111111 |
| Octal (base 8) | 134477 |
| Hexadecimal (base 16) | B93F |
| Base 3 | 2102001102 |
| As time | 47423 seconds = 13 h 10 min 23 s |
Is 47423 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 3) | 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 5) | 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 7) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 2) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 3) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 2) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 11) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 47423 a prime number?
No. 47423 = 47 × 1009, so it is divisible by 47.
What are the factors of 47423?
1, 47, 1009, 47423.
What is 47423 in binary?
1011100100111111 (hexadecimal B93F, octal 134477).
What is the square root of 47423?
About 217.7682.
Is 47423 divisible by 3?
No. Its digits add up to 20, which is not a multiple of 3.
What is special about the number 47423?
47423 is a happy number: repeatedly adding the squares of its digits reaches 1; a semiprime: 47 × 1009, the product of two primes.