The number 4390
4390 is a composite number with 8 divisors. Its prime factorisation is 2 × 5 × 439. Divisors (8): 1, 2, 5, 10, 439, 878, 2195, 4390.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
4390 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
4390 is composite. Its prime factorisation is
- 3
The divisors add up to 7920; without 4390 itself that is 3530, so 4390 is deficient (3530 is less than 4390). Euler's totient φ(4390) = 1752 numbers up to 4390 share no factor with it.
- 4
The digits of 4390 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 139 steps to reach 1.
LaTeX source of the formulas on this page
\[ 4390 = 2 \times 5 \times 439 \]
4390 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 7920 |
| Euler totient φ(n) | 1752 |
| Square | 19272100 |
| Cube | 84604519000 |
| Square root | 66.257075 |
| Digit sum / digital root | 16 / 7 |
| Collatz steps to 1 | 139 |
| Scientific notation | 4.39 × |
4390 in other forms
| Form | Value |
|---|---|
| In words | four thousand three hundred and ninety |
| Binary (base 2) | 1000100100110 |
| Octal (base 8) | 10446 |
| Hexadecimal (base 16) | 1126 |
| Base 3 | 20000121 |
| As time | 4390 seconds = 1 h 13 min 10 s |
Is 4390 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (4390 ÷ 2 = 2195) | 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 2) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | Yes (4390 ÷ 5 = 878) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 4) | 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 6) | 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 | Yes (4390 ÷ 10 = 439) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 1) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 10) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 4390 a prime number?
No. 4390 = 2 × 5 × 439, so it is divisible by 2.
What are the factors of 4390?
1, 2, 5, 10, 439, 878, 2195, 4390.
What is 4390 in binary?
1000100100110 (hexadecimal 1126, octal 10446).
What is the square root of 4390?
About 66.2571.
Is 4390 divisible by 3?
No. Its digits add up to 16, which is not a multiple of 3.
What is special about the number 4390?
It is a composite number with 8 divisors.