The number 40019
40019 is a composite number with 4 divisors. Its prime factorisation is 7 × 5717. Divisors (4): 1, 7, 5717, 40019.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 40019: a semiprime: 7 × 5717, the product of two primes.
- 2
40019 is composite. Its prime factorisation is
- 3
The divisors add up to 45744; without 40019 itself that is 5725, so 40019 is deficient (5725 is less than 40019). Euler's totient φ(40019) = 34296 numbers up to 40019 share no factor with it.
- 4
The digits of 40019 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 168 steps to reach 1.
LaTeX source of the formulas on this page
\[ 40019 = 7 \times 5717 \]
40019 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 45744 |
| Euler totient φ(n) | 34296 |
| Square | 1601520361 |
| Cube | 64091243326859 |
| Square root | 200.047494 |
| Digit sum / digital root | 14 / 5 |
| Collatz steps to 1 | 168 |
| Scientific notation | 4.0019 × |
40019 in other forms
| Form | Value |
|---|---|
| In words | forty thousand and nineteen |
| Binary (base 2) | 1001110001010011 |
| Octal (base 8) | 116123 |
| Hexadecimal (base 16) | 9C53 |
| Base 3 | 2000220012 |
| As time | 40019 seconds = 11 h 6 min 59 s |
Is 40019 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 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 | Yes (40019 ÷ 7 = 5717) | 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 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 1) | 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 40019 a prime number?
No. 40019 = 7 × 5717, so it is divisible by 7.
What are the factors of 40019?
1, 7, 5717, 40019.
What is 40019 in binary?
1001110001010011 (hexadecimal 9C53, octal 116123).
What is the square root of 40019?
About 200.0475.
Is 40019 divisible by 3?
No. Its digits add up to 14, which is not a multiple of 3.
What is special about the number 40019?
40019 is a semiprime: 7 × 5717, the product of two primes.