The number 13942
13942 is a composite number with 4 divisors. Its prime factorisation is 2 × 6971. Divisors (4): 1, 2, 6971, 13942.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 13942: a semiprime: 2 × 6971, the product of two primes.
- 2
13942 is composite. Its prime factorisation is
- 3
The divisors add up to 20916; without 13942 itself that is 6974, so 13942 is deficient (6974 is less than 13942). Euler's totient φ(13942) = 6970 numbers up to 13942 share no factor with it.
- 4
The digits of 13942 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 58 steps to reach 1.
LaTeX source of the formulas on this page
\[ 13942 = 2 \times 6971 \]
13942 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 20916 |
| Euler totient φ(n) | 6970 |
| Square | 194379364 |
| Cube | 2710037092888 |
| Square root | 118.076247 |
| Digit sum / digital root | 19 / 1 |
| Collatz steps to 1 | 58 |
| Scientific notation | 1.3942 × |
13942 in other forms
| Form | Value |
|---|---|
| In words | thirteen thousand nine hundred and forty-two |
| Binary (base 2) | 11011001110110 |
| Octal (base 8) | 33166 |
| Hexadecimal (base 16) | 3676 |
| Base 3 | 201010101 |
| As time | 13942 seconds = 3 h 52 min 22 s |
Is 13942 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (13942 ÷ 2 = 6971) | 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 2) | 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 5) | 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 2) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 5) | 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 13942 a prime number?
No. 13942 = 2 × 6971, so it is divisible by 2.
What are the factors of 13942?
1, 2, 6971, 13942.
What is 13942 in binary?
11011001110110 (hexadecimal 3676, octal 33166).
What is the square root of 13942?
About 118.0762.
Is 13942 divisible by 3?
No. Its digits add up to 19, which is not a multiple of 3.
What is special about the number 13942?
13942 is a semiprime: 2 × 6971, the product of two primes.