The number 6443
6443 is a composite number with 4 divisors. Its prime factorisation is 17 × 379. Divisors (4): 1, 17, 379, 6443.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 6443: a Harshad number: divisible by its digit sum 17; a semiprime: 17 × 379, the product of two primes.
- 2
6443 is composite. Its prime factorisation is
- 3
The divisors add up to 6840; without 6443 itself that is 397, so 6443 is deficient (397 is less than 6443). Euler's totient φ(6443) = 6048 numbers up to 6443 share no factor with it.
- 4
The digits of 6443 add up to 17, and repeating that until one digit is left gives the digital root 8. The Collatz sequence (halve if even, else 3n+1) takes 75 steps to reach 1.
LaTeX source of the formulas on this page
\[ 6443 = 17 \times 379 \]
6443 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 6840 |
| Euler totient φ(n) | 6048 |
| Square | 41512249 |
| Cube | 267463420307 |
| Square root | 80.268300 |
| Digit sum / digital root | 17 / 8 |
| Collatz steps to 1 | 75 |
| Scientific notation | 6.443 × |
6443 in other forms
| Form | Value |
|---|---|
| In words | six thousand four hundred and forty-three |
| Binary (base 2) | 1100100101011 |
| Octal (base 8) | 14453 |
| Hexadecimal (base 16) | 192B |
| Base 3 | 22211122 |
| As time | 6443 seconds = 1 h 47 min 23 s |
Is 6443 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 8) | 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 8) | 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 6443 a prime number?
No. 6443 = 17 × 379, so it is divisible by 17.
What are the factors of 6443?
1, 17, 379, 6443.
What is 6443 in binary?
1100100101011 (hexadecimal 192B, octal 14453).
What is the square root of 6443?
About 80.2683.
Is 6443 divisible by 3?
No. Its digits add up to 17, which is not a multiple of 3.
What is special about the number 6443?
6443 is a Harshad number: divisible by its digit sum 17; a semiprime: 17 × 379, the product of two primes.