The number 40069
40069 is a composite number with 4 divisors. Its prime factorisation is 17 × 2357. Divisors (4): 1, 17, 2357, 40069.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 40069: a happy number: repeatedly adding the squares of its digits reaches 1; a semiprime: 17 × 2357, the product of two primes.
- 2
40069 is composite. Its prime factorisation is
- 3
The divisors add up to 42444; without 40069 itself that is 2375, so 40069 is deficient (2375 is less than 40069). Euler's totient φ(40069) = 37696 numbers up to 40069 share no factor with it.
- 4
The digits of 40069 add up to 19, and repeating that until one digit is left gives the digital root 1. The Collatz sequence (halve if even, else 3n+1) takes 93 steps to reach 1.
LaTeX source of the formulas on this page
\[ 40069 = 17 \times 2357 \]
40069 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 42444 |
| Euler totient φ(n) | 37696 |
| Square | 1605524761 |
| Cube | 64331771648509 |
| Square root | 200.172426 |
| Digit sum / digital root | 19 / 1 |
| Collatz steps to 1 | 93 |
| Scientific notation | 4.0069 × |
40069 in other forms
| Form | Value |
|---|---|
| In words | forty thousand and sixty-nine |
| Binary (base 2) | 1001110010000101 |
| Octal (base 8) | 116205 |
| Hexadecimal (base 16) | 9C85 |
| Base 3 | 2000222001 |
| As time | 40069 seconds = 11 h 7 min 49 s |
Is 40069 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 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 1) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 1) | 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 1) | 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 7) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 1) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 40069 a prime number?
No. 40069 = 17 × 2357, so it is divisible by 17.
What are the factors of 40069?
1, 17, 2357, 40069.
What is 40069 in binary?
1001110010000101 (hexadecimal 9C85, octal 116205).
What is the square root of 40069?
About 200.1724.
Is 40069 divisible by 3?
No. Its digits add up to 19, which is not a multiple of 3.
What is special about the number 40069?
40069 is a happy number: repeatedly adding the squares of its digits reaches 1; a semiprime: 17 × 2357, the product of two primes.