The number 40691
40691 is a composite number with 4 divisors. Its prime factorisation is 7 × 5813. Divisors (4): 1, 7, 5813, 40691.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 40691: a semiprime: 7 × 5813, the product of two primes.
- 2
40691 is composite. Its prime factorisation is
- 3
The divisors add up to 46512; without 40691 itself that is 5821, so 40691 is deficient (5821 is less than 40691). Euler's totient φ(40691) = 34872 numbers up to 40691 share no factor with it.
- 4
The digits of 40691 add up to 20, and repeating that until one digit is left gives the digital root 2. The Collatz sequence (halve if even, else 3n+1) takes 88 steps to reach 1.
LaTeX source of the formulas on this page
\[ 40691 = 7 \times 5813 \]
40691 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 46512 |
| Euler totient φ(n) | 34872 |
| Square | 1655757481 |
| Cube | 67374427659371 |
| Square root | 201.720103 |
| Digit sum / digital root | 20 / 2 |
| Collatz steps to 1 | 88 |
| Scientific notation | 4.0691 × |
40691 in other forms
| Form | Value |
|---|---|
| In words | forty thousand six hundred and ninety-one |
| Binary (base 2) | 1001111011110011 |
| Octal (base 8) | 117363 |
| Hexadecimal (base 16) | 9EF3 |
| Base 3 | 2001211002 |
| As time | 40691 seconds = 11 h 18 min 11 s |
Is 40691 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 1) | 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 | Yes (40691 ÷ 7 = 5813) | 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 2) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 1) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 2) | 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 40691 a prime number?
No. 40691 = 7 × 5813, so it is divisible by 7.
What are the factors of 40691?
1, 7, 5813, 40691.
What is 40691 in binary?
1001111011110011 (hexadecimal 9EF3, octal 117363).
What is the square root of 40691?
About 201.7201.
Is 40691 divisible by 3?
No. Its digits add up to 20, which is not a multiple of 3.
What is special about the number 40691?
40691 is a semiprime: 7 × 5813, the product of two primes.