The number 40438
40438 is a composite number with 4 divisors. Its prime factorisation is 2 × 20219. Divisors (4): 1, 2, 20219, 40438.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 40438: a semiprime: 2 × 20219, the product of two primes.
- 2
40438 is composite. Its prime factorisation is
- 3
The divisors add up to 60660; without 40438 itself that is 20222, so 40438 is deficient (20222 is less than 40438). Euler's totient φ(40438) = 20218 numbers up to 40438 share no factor with it.
- 4
The digits of 40438 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 88 steps to reach 1.
LaTeX source of the formulas on this page
\[ 40438 = 2 \times 20219 \]
40438 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 60660 |
| Euler totient φ(n) | 20218 |
| Square | 1635231844 |
| Cube | 66125505307672 |
| Square root | 201.092019 |
| Digit sum / digital root | 19 / 1 |
| Collatz steps to 1 | 88 |
| Scientific notation | 4.0438 × |
40438 in other forms
| Form | Value |
|---|---|
| In words | forty thousand four hundred and thirty-eight |
| Binary (base 2) | 1001110111110110 |
| Octal (base 8) | 116766 |
| Hexadecimal (base 16) | 9DF6 |
| Base 3 | 2001110201 |
| As time | 40438 seconds = 11 h 13 min 58 s |
Is 40438 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (40438 ÷ 2 = 20219) | 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 2) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | No (remainder 3) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 4) | 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 6) | 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 8) | 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 10) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 40438 a prime number?
No. 40438 = 2 × 20219, so it is divisible by 2.
What are the factors of 40438?
1, 2, 20219, 40438.
What is 40438 in binary?
1001110111110110 (hexadecimal 9DF6, octal 116766).
What is the square root of 40438?
About 201.0920.
Is 40438 divisible by 3?
No. Its digits add up to 19, which is not a multiple of 3.
What is special about the number 40438?
40438 is a semiprime: 2 × 20219, the product of two primes.