The number 12443
12443 is a composite number with 4 divisors. Its prime factorisation is 23 × 541. Divisors (4): 1, 23, 541, 12443.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 12443: a semiprime: 23 × 541, the product of two primes.
- 2
12443 is composite. Its prime factorisation is
- 3
The divisors add up to 13008; without 12443 itself that is 565, so 12443 is deficient (565 is less than 12443). Euler's totient φ(12443) = 11880 numbers up to 12443 share no factor with it.
- 4
The digits of 12443 add up to 14, and repeating that until one digit is left gives the digital root 5. The Collatz sequence (halve if even, else 3n+1) takes 94 steps to reach 1.
LaTeX source of the formulas on this page
\[ 12443 = 23 \times 541 \]
12443 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 13008 |
| Euler totient φ(n) | 11880 |
| Square | 154828249 |
| Cube | 1926527902307 |
| Square root | 111.548196 |
| Digit sum / digital root | 14 / 5 |
| Collatz steps to 1 | 94 |
| Scientific notation | 1.2443 × |
12443 in other forms
| Form | Value |
|---|---|
| In words | twelve thousand four hundred and forty-three |
| Binary (base 2) | 11000010011011 |
| Octal (base 8) | 30233 |
| Hexadecimal (base 16) | 309B |
| Base 3 | 122001212 |
| As time | 12443 seconds = 3 h 27 min 23 s |
Is 12443 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 4) | 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 3) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 5) | 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 12443 a prime number?
No. 12443 = 23 × 541, so it is divisible by 23.
What are the factors of 12443?
1, 23, 541, 12443.
What is 12443 in binary?
11000010011011 (hexadecimal 309B, octal 30233).
What is the square root of 12443?
About 111.5482.
Is 12443 divisible by 3?
No. Its digits add up to 14, which is not a multiple of 3.
What is special about the number 12443?
12443 is a semiprime: 23 × 541, the product of two primes.