The number 74389
74389 is a composite number with 4 divisors. Its prime factorisation is 7 × 10627. Divisors (4): 1, 7, 10627, 74389.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 74389: a happy number: repeatedly adding the squares of its digits reaches 1; a semiprime: 7 × 10627, the product of two primes.
- 2
74389 is composite. Its prime factorisation is
- 3
The divisors add up to 85024; without 74389 itself that is 10635, so 74389 is deficient (10635 is less than 74389). Euler's totient φ(74389) = 63756 numbers up to 74389 share no factor with it.
- 4
The digits of 74389 add up to 31, and repeating that until one digit is left gives the digital root 4. The Collatz sequence (halve if even, else 3n+1) takes 138 steps to reach 1.
LaTeX source of the formulas on this page
\[ 74389 = 7 \times 10627 \]
74389 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 85024 |
| Euler totient φ(n) | 63756 |
| Square | 5533723321 |
| Cube | 411648144125869 |
| Square root | 272.743469 |
| Digit sum / digital root | 31 / 4 |
| Collatz steps to 1 | 138 |
| Scientific notation | 7.4389 × |
74389 in other forms
| Form | Value |
|---|---|
| In words | seventy-four thousand three hundred and eighty-nine |
| Binary (base 2) | 10010001010010101 |
| Octal (base 8) | 221225 |
| Hexadecimal (base 16) | 12295 |
| Base 3 | 10210001011 |
| As time | 74389 seconds = 20 h 39 min 49 s |
Is 74389 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 1) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | No (remainder 4) | 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 | Yes (74389 ÷ 7 = 10627) | 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 5) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 4) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 9) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 7) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 1) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 74389 a prime number?
No. 74389 = 7 × 10627, so it is divisible by 7.
What are the factors of 74389?
1, 7, 10627, 74389.
What is 74389 in binary?
10010001010010101 (hexadecimal 12295, octal 221225).
What is the square root of 74389?
About 272.7435.
Is 74389 divisible by 3?
No. Its digits add up to 31, which is not a multiple of 3.
What is special about the number 74389?
74389 is a happy number: repeatedly adding the squares of its digits reaches 1; a semiprime: 7 × 10627, the product of two primes.