The number 40109
40109 is a composite number with 4 divisors. Its prime factorisation is 19 × 2111. Divisors (4): 1, 19, 2111, 40109.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 40109: a semiprime: 19 × 2111, the product of two primes.
- 2
40109 is composite. Its prime factorisation is
- 3
The divisors add up to 42240; without 40109 itself that is 2131, so 40109 is deficient (2131 is less than 40109). Euler's totient φ(40109) = 37980 numbers up to 40109 share no factor with it.
- 4
The digits of 40109 add up to 14, and repeating that until one digit is left gives the digital root 5. The Collatz sequence (halve if even, else 3n+1) takes 93 steps to reach 1.
LaTeX source of the formulas on this page
\[ 40109 = 19 \times 2111 \]
40109 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 42240 |
| Euler totient φ(n) | 37980 |
| Square | 1608731881 |
| Cube | 64524627015029 |
| Square root | 200.272315 |
| Digit sum / digital root | 14 / 5 |
| Collatz steps to 1 | 93 |
| Scientific notation | 4.0109 × |
40109 in other forms
| Form | Value |
|---|---|
| In words | forty thousand one hundred and nine |
| Binary (base 2) | 1001110010101101 |
| Octal (base 8) | 116255 |
| Hexadecimal (base 16) | 9CAD |
| Base 3 | 2001000112 |
| As time | 40109 seconds = 11 h 8 min 29 s |
Is 40109 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 1) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | No (remainder 4) | 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 | No (remainder 6) | 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 5) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 5) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 9) | 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 5) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 40109 a prime number?
No. 40109 = 19 × 2111, so it is divisible by 19.
What are the factors of 40109?
1, 19, 2111, 40109.
What is 40109 in binary?
1001110010101101 (hexadecimal 9CAD, octal 116255).
What is the square root of 40109?
About 200.2723.
Is 40109 divisible by 3?
No. Its digits add up to 14, which is not a multiple of 3.
What is special about the number 40109?
40109 is a semiprime: 19 × 2111, the product of two primes.