The number 38890
38890 is a composite number with 8 divisors. Its prime factorisation is 2 × 5 × 3889. Divisors (8): 1, 2, 5, 10, 3889, 7778, 19445, 38890.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
38890 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
38890 is composite. Its prime factorisation is
- 3
The divisors add up to 70020; without 38890 itself that is 31130, so 38890 is deficient (31130 is less than 38890). Euler's totient φ(38890) = 15552 numbers up to 38890 share no factor with it.
- 4
The digits of 38890 add up to 28, and repeating that until one digit is left gives the digital root 1. The Collatz sequence (halve if even, else 3n+1) takes 168 steps to reach 1.
LaTeX source of the formulas on this page
\[ 38890 = 2 \times 5 \times 3889 \]
38890 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 70020 |
| Euler totient φ(n) | 15552 |
| Square | 1512432100 |
| Cube | 58818484369000 |
| Square root | 197.205477 |
| Digit sum / digital root | 28 / 1 |
| Collatz steps to 1 | 168 |
| Scientific notation | 3.889 × |
38890 in other forms
| Form | Value |
|---|---|
| In words | thirty-eight thousand eight hundred and ninety |
| Binary (base 2) | 1001011111101010 |
| Octal (base 8) | 113752 |
| Hexadecimal (base 16) | 97EA |
| Base 3 | 1222100101 |
| As time | 38890 seconds = 10 h 48 min 10 s |
Is 38890 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (38890 ÷ 2 = 19445) | 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 (38890 ÷ 5 = 7778) | 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 5) | 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 2) | 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 | Yes (38890 ÷ 10 = 3889) | 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 10) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 38890 a prime number?
No. 38890 = 2 × 5 × 3889, so it is divisible by 2.
What are the factors of 38890?
1, 2, 5, 10, 3889, 7778, 19445, 38890.
What is 38890 in binary?
1001011111101010 (hexadecimal 97EA, octal 113752).
What is the square root of 38890?
About 197.2055.
Is 38890 divisible by 3?
No. Its digits add up to 28, which is not a multiple of 3.
What is special about the number 38890?
It is a composite number with 8 divisors.