The number 74243
74243 is a composite number with 4 divisors. Its prime factorisation is 13 × 5711. Divisors (4): 1, 13, 5711, 74243.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 74243: a happy number: repeatedly adding the squares of its digits reaches 1; a semiprime: 13 × 5711, the product of two primes.
- 2
74243 is composite. Its prime factorisation is
- 3
The divisors add up to 79968; without 74243 itself that is 5725, so 74243 is deficient (5725 is less than 74243). Euler's totient φ(74243) = 68520 numbers up to 74243 share no factor with it.
- 4
The digits of 74243 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 112 steps to reach 1.
LaTeX source of the formulas on this page
\[ 74243 = 13 \times 5711 \]
74243 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 79968 |
| Euler totient φ(n) | 68520 |
| Square | 5512023049 |
| Cube | 409229127226907 |
| Square root | 272.475687 |
| Digit sum / digital root | 20 / 2 |
| Collatz steps to 1 | 112 |
| Scientific notation | 7.4243 × |
74243 in other forms
| Form | Value |
|---|---|
| In words | seventy-four thousand two hundred and forty-three |
| Binary (base 2) | 10010001000000011 |
| Octal (base 8) | 221003 |
| Hexadecimal (base 16) | 12203 |
| Base 3 | 10202211202 |
| As time | 74243 seconds = 20 h 37 min 23 s |
Is 74243 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 2) | 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 5) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 1) | 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 2) | 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 4) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 11) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 74243 a prime number?
No. 74243 = 13 × 5711, so it is divisible by 13.
What are the factors of 74243?
1, 13, 5711, 74243.
What is 74243 in binary?
10010001000000011 (hexadecimal 12203, octal 221003).
What is the square root of 74243?
About 272.4757.
Is 74243 divisible by 3?
No. Its digits add up to 20, which is not a multiple of 3.
What is special about the number 74243?
74243 is a happy number: repeatedly adding the squares of its digits reaches 1; a semiprime: 13 × 5711, the product of two primes.