The number 40142
40142 is a composite number with 4 divisors. Its prime factorisation is 2 × 20071. Divisors (4): 1, 2, 20071, 40142.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 40142: a semiprime: 2 × 20071, the product of two primes.
- 2
40142 is composite. Its prime factorisation is
- 3
The divisors add up to 60216; without 40142 itself that is 20074, so 40142 is deficient (20074 is less than 40142). Euler's totient φ(40142) = 20070 numbers up to 40142 share no factor with it.
- 4
The digits of 40142 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 49 steps to reach 1.
LaTeX source of the formulas on this page
\[ 40142 = 2 \times 20071 \]
40142 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 60216 |
| Euler totient φ(n) | 20070 |
| Square | 1611380164 |
| Cube | 64684022543288 |
| Square root | 200.354685 |
| Digit sum / digital root | 11 / 2 |
| Collatz steps to 1 | 49 |
| Scientific notation | 4.0142 × |
40142 in other forms
| Form | Value |
|---|---|
| In words | forty thousand one hundred and forty-two |
| Binary (base 2) | 1001110011001110 |
| Octal (base 8) | 116316 |
| Hexadecimal (base 16) | 9CCE |
| Base 3 | 2001001202 |
| As time | 40142 seconds = 11 h 9 min 2 s |
Is 40142 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (40142 ÷ 2 = 20071) | 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 2) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | No (remainder 2) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 2) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 4) | 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 2) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 2) | 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 2) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 40142 a prime number?
No. 40142 = 2 × 20071, so it is divisible by 2.
What are the factors of 40142?
1, 2, 20071, 40142.
What is 40142 in binary?
1001110011001110 (hexadecimal 9CCE, octal 116316).
What is the square root of 40142?
About 200.3547.
Is 40142 divisible by 3?
No. Its digits add up to 11, which is not a multiple of 3.
What is special about the number 40142?
40142 is a semiprime: 2 × 20071, the product of two primes.