The number 40421
40421 is a composite number with 4 divisors. Its prime factorisation is 83 × 487. Divisors (4): 1, 83, 487, 40421.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 40421: a semiprime: 83 × 487, the product of two primes.
- 2
40421 is composite. Its prime factorisation is
- 3
The divisors add up to 40992; without 40421 itself that is 571, so 40421 is deficient (571 is less than 40421). Euler's totient φ(40421) = 39852 numbers up to 40421 share no factor with it.
- 4
The digits of 40421 add up to 11, and repeating that until one digit is left gives the digital root 2. The Collatz sequence (halve if even, else 3n+1) takes 137 steps to reach 1.
LaTeX source of the formulas on this page
\[ 40421 = 83 \times 487 \]
40421 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 40992 |
| Euler totient φ(n) | 39852 |
| Square | 1633857241 |
| Cube | 66042143538461 |
| Square root | 201.049745 |
| Digit sum / digital root | 11 / 2 |
| Collatz steps to 1 | 137 |
| Scientific notation | 4.0421 × |
40421 in other forms
| Form | Value |
|---|---|
| In words | forty thousand four hundred and twenty-one |
| Binary (base 2) | 1001110111100101 |
| Octal (base 8) | 116745 |
| Hexadecimal (base 16) | 9DE5 |
| Base 3 | 2001110002 |
| As time | 40421 seconds = 11 h 13 min 41 s |
Is 40421 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 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 | No (remainder 3) | 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 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 7) | 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 40421 a prime number?
No. 40421 = 83 × 487, so it is divisible by 83.
What are the factors of 40421?
1, 83, 487, 40421.
What is 40421 in binary?
1001110111100101 (hexadecimal 9DE5, octal 116745).
What is the square root of 40421?
About 201.0497.
Is 40421 divisible by 3?
No. Its digits add up to 11, which is not a multiple of 3.
What is special about the number 40421?
40421 is a semiprime: 83 × 487, the product of two primes.