The number 55423
55423 is a composite number with 4 divisors. Its prime factorisation is 19 × 2917. Divisors (4): 1, 19, 2917, 55423.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 55423: a happy number: repeatedly adding the squares of its digits reaches 1; a Harshad number: divisible by its digit sum 19; a semiprime: 19 × 2917, the product of two primes.
- 2
55423 is composite. Its prime factorisation is
- 3
The divisors add up to 58360; without 55423 itself that is 2937, so 55423 is deficient (2937 is less than 55423). Euler's totient φ(55423) = 52488 numbers up to 55423 share no factor with it.
- 4
The digits of 55423 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 91 steps to reach 1.
LaTeX source of the formulas on this page
\[ 55423 = 19 \times 2917 \]
55423 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 58360 |
| Euler totient φ(n) | 52488 |
| Square | 3071708929 |
| Cube | 170243323971967 |
| Square root | 235.420900 |
| Digit sum / digital root | 19 / 1 |
| Collatz steps to 1 | 91 |
| Scientific notation | 5.5423 × |
55423 in other forms
| Form | Value |
|---|---|
| In words | fifty-five thousand four hundred and twenty-three |
| Binary (base 2) | 1101100001111111 |
| Octal (base 8) | 154177 |
| Hexadecimal (base 16) | D87F |
| Base 3 | 2211000201 |
| As time | 55423 seconds = 15 h 23 min 43 s |
Is 55423 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 | No (remainder 1) | 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 1) | 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 7) | 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 3) | 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 7) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 55423 a prime number?
No. 55423 = 19 × 2917, so it is divisible by 19.
What are the factors of 55423?
1, 19, 2917, 55423.
What is 55423 in binary?
1101100001111111 (hexadecimal D87F, octal 154177).
What is the square root of 55423?
About 235.4209.
Is 55423 divisible by 3?
No. Its digits add up to 19, which is not a multiple of 3.
What is special about the number 55423?
55423 is a happy number: repeatedly adding the squares of its digits reaches 1; a Harshad number: divisible by its digit sum 19; a semiprime: 19 × 2917, the product of two primes.