The number 40243
40243 is a composite number with 4 divisors. Its prime factorisation is 7 × 5749. Divisors (4): 1, 7, 5749, 40243.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 40243: a semiprime: 7 × 5749, the product of two primes.
- 2
40243 is composite. Its prime factorisation is
- 3
The divisors add up to 46000; without 40243 itself that is 5757, so 40243 is deficient (5757 is less than 40243). Euler's totient φ(40243) = 34488 numbers up to 40243 share no factor with it.
- 4
The digits of 40243 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 75 steps to reach 1.
LaTeX source of the formulas on this page
\[ 40243 = 7 \times 5749 \]
40243 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 46000 |
| Euler totient φ(n) | 34488 |
| Square | 1619499049 |
| Cube | 65173500228907 |
| Square root | 200.606580 |
| Digit sum / digital root | 13 / 4 |
| Collatz steps to 1 | 75 |
| Scientific notation | 4.0243 × |
40243 in other forms
| Form | Value |
|---|---|
| In words | forty thousand two hundred and forty-three |
| Binary (base 2) | 1001110100110011 |
| Octal (base 8) | 116463 |
| Hexadecimal (base 16) | 9D33 |
| Base 3 | 2001012111 |
| As time | 40243 seconds = 11 h 10 min 43 s |
Is 40243 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 (40243 ÷ 7 = 5749) | 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 5) | 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 40243 a prime number?
No. 40243 = 7 × 5749, so it is divisible by 7.
What are the factors of 40243?
1, 7, 5749, 40243.
What is 40243 in binary?
1001110100110011 (hexadecimal 9D33, octal 116463).
What is the square root of 40243?
About 200.6066.
Is 40243 divisible by 3?
No. Its digits add up to 13, which is not a multiple of 3.
What is special about the number 40243?
40243 is a semiprime: 7 × 5749, the product of two primes.