The number 27443
27443 is a composite number with 4 divisors. Its prime factorisation is 13 × 2111. Divisors (4): 1, 13, 2111, 27443.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 27443: a happy number: repeatedly adding the squares of its digits reaches 1; a semiprime: 13 × 2111, the product of two primes.
- 2
27443 is composite. Its prime factorisation is
- 3
The divisors add up to 29568; without 27443 itself that is 2125, so 27443 is deficient (2125 is less than 27443). Euler's totient φ(27443) = 25320 numbers up to 27443 share no factor with it.
- 4
The digits of 27443 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 64 steps to reach 1.
LaTeX source of the formulas on this page
\[ 27443 = 13 \times 2111 \]
27443 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 29568 |
| Euler totient φ(n) | 25320 |
| Square | 753118249 |
| Cube | 20667824107307 |
| Square root | 165.659289 |
| Digit sum / digital root | 20 / 2 |
| Collatz steps to 1 | 64 |
| Scientific notation | 2.7443 × |
27443 in other forms
| Form | Value |
|---|---|
| In words | twenty-seven thousand four hundred and forty-three |
| Binary (base 2) | 110101100110011 |
| Octal (base 8) | 65463 |
| Hexadecimal (base 16) | 6B33 |
| Base 3 | 1101122102 |
| As time | 27443 seconds = 7 h 37 min 23 s |
Is 27443 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 3) | 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 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 9) | 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 27443 a prime number?
No. 27443 = 13 × 2111, so it is divisible by 13.
What are the factors of 27443?
1, 13, 2111, 27443.
What is 27443 in binary?
110101100110011 (hexadecimal 6B33, octal 65463).
What is the square root of 27443?
About 165.6593.
Is 27443 divisible by 3?
No. Its digits add up to 20, which is not a multiple of 3.
What is special about the number 27443?
27443 is a happy number: repeatedly adding the squares of its digits reaches 1; a semiprime: 13 × 2111, the product of two primes.