The number 55443
55443 is a composite number with 4 divisors. Its prime factorisation is 3 × 18481. Divisors (4): 1, 3, 18481, 55443.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 55443: a happy number: repeatedly adding the squares of its digits reaches 1; a semiprime: 3 × 18481, the product of two primes.
- 2
55443 is composite. Its prime factorisation is
- 3
The divisors add up to 73928; without 55443 itself that is 18485, so 55443 is deficient (18485 is less than 55443). Euler's totient φ(55443) = 36960 numbers up to 55443 share no factor with it.
- 4
The digits of 55443 add up to 21, and repeating that until one digit is left gives the digital root 3. The Collatz sequence (halve if even, else 3n+1) takes 91 steps to reach 1.
LaTeX source of the formulas on this page
\[ 55443 = 3 \times 18481 \]
55443 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 73928 |
| Euler totient φ(n) | 36960 |
| Square | 3073926249 |
| Cube | 170427693023307 |
| Square root | 235.463373 |
| Digit sum / digital root | 21 / 3 |
| Collatz steps to 1 | 91 |
| Scientific notation | 5.5443 × |
55443 in other forms
| Form | Value |
|---|---|
| In words | fifty-five thousand four hundred and forty-three |
| Binary (base 2) | 1101100010010011 |
| Octal (base 8) | 154223 |
| Hexadecimal (base 16) | D893 |
| Base 3 | 2211001110 |
| As time | 55443 seconds = 15 h 24 min 3 s |
Is 55443 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 | Yes (55443 ÷ 3 = 18481) | A number is divisible by 3 if the digits add up to a multiple of 3. |
| 4 | No (remainder 3) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | No (remainder 3) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 3) | 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 3) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 3) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 3) | 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 3) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 55443 a prime number?
No. 55443 = 3 × 18481, so it is divisible by 3.
What are the factors of 55443?
1, 3, 18481, 55443.
What is 55443 in binary?
1101100010010011 (hexadecimal D893, octal 154223).
What is the square root of 55443?
About 235.4634.
Is 55443 divisible by 3?
Yes. Its digits add up to 21, a multiple of 3.
What is special about the number 55443?
55443 is a happy number: repeatedly adding the squares of its digits reaches 1; a semiprime: 3 × 18481, the product of two primes.