The number 55442
55442 is a composite number with 8 divisors. Its prime factorisation is 2 × 19 × 1459. Divisors (8): 1, 2, 19, 38, 1459, 2918, 27721, 55442.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 55442: a happy number: repeatedly adding the squares of its digits reaches 1.
- 2
55442 is composite. Its prime factorisation is
- 3
The divisors add up to 87600; without 55442 itself that is 32158, so 55442 is deficient (32158 is less than 55442). Euler's totient φ(55442) = 26244 numbers up to 55442 share no factor with it.
- 4
The digits of 55442 add up to 20, and repeating that until one digit is left gives the digital root 2. The Collatz sequence (halve if even, else 3n+1) takes 91 steps to reach 1.
LaTeX source of the formulas on this page
\[ 55442 = 2 \times 19 \times 1459 \]
55442 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 87600 |
| Euler totient φ(n) | 26244 |
| Square | 3073815364 |
| Cube | 170418471410888 |
| Square root | 235.461249 |
| Digit sum / digital root | 20 / 2 |
| Collatz steps to 1 | 91 |
| Scientific notation | 5.5442 × |
55442 in other forms
| Form | Value |
|---|---|
| In words | fifty-five thousand four hundred and forty-two |
| Binary (base 2) | 1101100010010010 |
| Octal (base 8) | 154222 |
| Hexadecimal (base 16) | D892 |
| Base 3 | 2211001102 |
| As time | 55442 seconds = 15 h 24 min 2 s |
Is 55442 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (55442 ÷ 2 = 27721) | 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 2) | 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 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 2) | 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 55442 a prime number?
No. 55442 = 2 × 19 × 1459, so it is divisible by 2.
What are the factors of 55442?
1, 2, 19, 38, 1459, 2918, 27721, 55442.
What is 55442 in binary?
1101100010010010 (hexadecimal D892, octal 154222).
What is the square root of 55442?
About 235.4612.
Is 55442 divisible by 3?
No. Its digits add up to 20, which is not a multiple of 3.
What is special about the number 55442?
55442 is a happy number: repeatedly adding the squares of its digits reaches 1.