The number 15442
15442 is a composite number with 8 divisors. Its prime factorisation is 2 × 7 × 1103. Divisors (8): 1, 2, 7, 14, 1103, 2206, 7721, 15442.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
15442 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
15442 is composite. Its prime factorisation is
- 3
The divisors add up to 26496; without 15442 itself that is 11054, so 15442 is deficient (11054 is less than 15442). Euler's totient φ(15442) = 6612 numbers up to 15442 share no factor with it.
- 4
The digits of 15442 add up to 16, and repeating that until one digit is left gives the digital root 7. The Collatz sequence (halve if even, else 3n+1) takes 115 steps to reach 1.
LaTeX source of the formulas on this page
\[ 15442 = 2 \times 7 \times 1103 \]
15442 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 26496 |
| Euler totient φ(n) | 6612 |
| Square | 238455364 |
| Cube | 3682227730888 |
| Square root | 124.265844 |
| Digit sum / digital root | 16 / 7 |
| Collatz steps to 1 | 115 |
| Scientific notation | 1.5442 × |
15442 in other forms
| Form | Value |
|---|---|
| In words | fifteen thousand four hundred and forty-two |
| Binary (base 2) | 11110001010010 |
| Octal (base 8) | 36122 |
| Hexadecimal (base 16) | 3C52 |
| Base 3 | 210011221 |
| As time | 15442 seconds = 4 h 17 min 22 s |
Is 15442 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (15442 ÷ 2 = 7721) | 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 | Yes (15442 ÷ 7 = 2206) | 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 2) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 7) | 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 9) | 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 15442 a prime number?
No. 15442 = 2 × 7 × 1103, so it is divisible by 2.
What are the factors of 15442?
1, 2, 7, 14, 1103, 2206, 7721, 15442.
What is 15442 in binary?
11110001010010 (hexadecimal 3C52, octal 36122).
What is the square root of 15442?
About 124.2658.
Is 15442 divisible by 3?
No. Its digits add up to 16, which is not a multiple of 3.
What is special about the number 15442?
It is a composite number with 8 divisors.