The number 7423
7423 is a composite number with 4 divisors. Its prime factorisation is 13 × 571. Divisors (4): 1, 13, 571, 7423.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 7423: a semiprime: 13 × 571, the product of two primes.
- 2
7423 is composite. Its prime factorisation is
- 3
The divisors add up to 8008; without 7423 itself that is 585, so 7423 is deficient (585 is less than 7423). Euler's totient φ(7423) = 6840 numbers up to 7423 share no factor with it.
- 4
The digits of 7423 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 238 steps to reach 1.
LaTeX source of the formulas on this page
\[ 7423 = 13 \times 571 \]
7423 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 8008 |
| Euler totient φ(n) | 6840 |
| Square | 55100929 |
| Cube | 409014195967 |
| Square root | 86.156834 |
| Digit sum / digital root | 16 / 7 |
| Collatz steps to 1 | 238 |
| Scientific notation | 7.423 × |
7423 in other forms
| Form | Value |
|---|---|
| In words | seven thousand four hundred and twenty-three |
| Binary (base 2) | 1110011111111 |
| Octal (base 8) | 16377 |
| Hexadecimal (base 16) | 1CFF |
| Base 3 | 101011221 |
| As time | 7423 seconds = 2 h 3 min 43 s |
Is 7423 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 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 7) | 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 3) | 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 7) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 7423 a prime number?
No. 7423 = 13 × 571, so it is divisible by 13.
What are the factors of 7423?
1, 13, 571, 7423.
What is 7423 in binary?
1110011111111 (hexadecimal 1CFF, octal 16377).
What is the square root of 7423?
About 86.1568.
Is 7423 divisible by 3?
No. Its digits add up to 16, which is not a multiple of 3.
What is special about the number 7423?
7423 is a semiprime: 13 × 571, the product of two primes.