The number 2443
2443 is a composite number with 4 divisors. Its prime factorisation is 7 × 349. Divisors (4): 1, 7, 349, 2443.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 2443: a semiprime: 7 × 349, the product of two primes.
- 2
2443 is composite. Its prime factorisation is
- 3
The divisors add up to 2800; without 2443 itself that is 357, so 2443 is deficient (357 is less than 2443). Euler's totient φ(2443) = 2088 numbers up to 2443 share no factor with it.
- 4
The digits of 2443 add up to 13, and repeating that until one digit is left gives the digital root 4. The Collatz sequence (halve if even, else 3n+1) takes 45 steps to reach 1.
LaTeX source of the formulas on this page
\[ 2443 = 7 \times 349 \]
2443 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 2800 |
| Euler totient φ(n) | 2088 |
| Square | 5968249 |
| Cube | 14580432307 |
| Square root | 49.426713 |
| Digit sum / digital root | 13 / 4 |
| Collatz steps to 1 | 45 |
| Scientific notation | 2.443 × |
2443 in other forms
| Form | Value |
|---|---|
| In words | two thousand four hundred and forty-three |
| Roman numerals | MMCDXLIII |
| Binary (base 2) | 100110001011 |
| Octal (base 8) | 4613 |
| Hexadecimal (base 16) | 98B |
| Base 3 | 10100111 |
| As time | 2443 seconds = 40 min 43 s |
Is 2443 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 1) | 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 1) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | Yes (2443 ÷ 7 = 349) | 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 4) | 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 1) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 7) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 2443 a prime number?
No. 2443 = 7 × 349, so it is divisible by 7.
What are the factors of 2443?
1, 7, 349, 2443.
What is 2443 in binary?
100110001011 (hexadecimal 98B, octal 4613).
What is the square root of 2443?
About 49.4267.
What is 2443 in Roman numerals?
MMCDXLIII.
Is 2443 divisible by 3?
No. Its digits add up to 13, which is not a multiple of 3.
What is special about the number 2443?
2443 is a semiprime: 7 × 349, the product of two primes.