The number 7143
7143 is a composite number with 4 divisors. Its prime factorisation is 3 × 2381. Divisors (4): 1, 3, 2381, 7143.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 7143: a semiprime: 3 × 2381, the product of two primes.
- 2
7143 is composite. Its prime factorisation is
- 3
The divisors add up to 9528; without 7143 itself that is 2385, so 7143 is deficient (2385 is less than 7143). Euler's totient φ(7143) = 4760 numbers up to 7143 share no factor with it.
- 4
The digits of 7143 add up to 15, and repeating that until one digit is left gives the digital root 6. The Collatz sequence (halve if even, else 3n+1) takes 194 steps to reach 1.
LaTeX source of the formulas on this page
\[ 7143 = 3 \times 2381 \]
7143 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 9528 |
| Euler totient φ(n) | 4760 |
| Square | 51022449 |
| Cube | 364453353207 |
| Square root | 84.516271 |
| Digit sum / digital root | 15 / 6 |
| Collatz steps to 1 | 194 |
| Scientific notation | 7.143 × |
7143 in other forms
| Form | Value |
|---|---|
| In words | seven thousand one hundred and forty-three |
| Binary (base 2) | 1101111100111 |
| Octal (base 8) | 15747 |
| Hexadecimal (base 16) | 1BE7 |
| Base 3 | 100210120 |
| As time | 7143 seconds = 1 h 59 min 3 s |
Is 7143 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 | Yes (7143 ÷ 3 = 2381) | 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 3) | 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 7) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 6) | 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 4) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 3) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 7143 a prime number?
No. 7143 = 3 × 2381, so it is divisible by 3.
What are the factors of 7143?
1, 3, 2381, 7143.
What is 7143 in binary?
1101111100111 (hexadecimal 1BE7, octal 15747).
What is the square root of 7143?
About 84.5163.
Is 7143 divisible by 3?
Yes. Its digits add up to 15, a multiple of 3.
What is special about the number 7143?
7143 is a semiprime: 3 × 2381, the product of two primes.