The number 40747
40747 is a composite number with 4 divisors. Its prime factorisation is 7 × 5821. Divisors (4): 1, 7, 5821, 40747.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 40747: a happy number: repeatedly adding the squares of its digits reaches 1; a semiprime: 7 × 5821, the product of two primes.
- 2
40747 is composite. Its prime factorisation is
- 3
The divisors add up to 46576; without 40747 itself that is 5829, so 40747 is deficient (5829 is less than 40747). Euler's totient φ(40747) = 34920 numbers up to 40747 share no factor with it.
- 4
The digits of 40747 add up to 22, and repeating that until one digit is left gives the digital root 4. The Collatz sequence (halve if even, else 3n+1) takes 36 steps to reach 1.
LaTeX source of the formulas on this page
\[ 40747 = 7 \times 5821 \]
40747 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 46576 |
| Euler totient φ(n) | 34920 |
| Square | 1660318009 |
| Cube | 67652977912723 |
| Square root | 201.858862 |
| Digit sum / digital root | 22 / 4 |
| Collatz steps to 1 | 36 |
| Scientific notation | 4.0747 × |
40747 in other forms
| Form | Value |
|---|---|
| In words | forty thousand seven hundred and forty-seven |
| Binary (base 2) | 1001111100101011 |
| Octal (base 8) | 117453 |
| Hexadecimal (base 16) | 9F2B |
| Base 3 | 2001220011 |
| As time | 40747 seconds = 11 h 19 min 7 s |
Is 40747 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 2) | 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 (40747 ÷ 7 = 5821) | 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 7) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 3) | 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 40747 a prime number?
No. 40747 = 7 × 5821, so it is divisible by 7.
What are the factors of 40747?
1, 7, 5821, 40747.
What is 40747 in binary?
1001111100101011 (hexadecimal 9F2B, octal 117453).
What is the square root of 40747?
About 201.8589.
Is 40747 divisible by 3?
No. Its digits add up to 22, which is not a multiple of 3.
What is special about the number 40747?
40747 is a happy number: repeatedly adding the squares of its digits reaches 1; a semiprime: 7 × 5821, the product of two primes.