The number 61438
61438 is a composite number with 16 divisors. Its prime factorisation is 2 × 13 × 17 × 139. Divisors (16): 1, 2, 13, 17, 26, 34, 139, 221, 278, 442, 1807, 2363, 3614, 4726, 30719, 61438.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
61438 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
61438 is composite. Its prime factorisation is
- 3
The divisors add up to 105840; without 61438 itself that is 44402, so 61438 is deficient (44402 is less than 61438). Euler's totient φ(61438) = 26496 numbers up to 61438 share no factor with it.
- 4
The digits of 61438 add up to 22, and repeating that until one digit is left gives the digital root 4. The Collatz sequence (halve if even, else 3n+1) takes 241 steps to reach 1.
LaTeX source of the formulas on this page
\[ 61438 = 2 \times 13 \times 17 \times 139 \]
61438 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 16 |
| Sum of divisors | 105840 |
| Euler totient φ(n) | 26496 |
| Square | 3774627844 |
| Cube | 231905585479672 |
| Square root | 247.866900 |
| Digit sum / digital root | 22 / 4 |
| Collatz steps to 1 | 241 |
| Scientific notation | 6.1438 × |
61438 in other forms
| Form | Value |
|---|---|
| In words | sixty-one thousand four hundred and thirty-eight |
| Binary (base 2) | 1110111111111110 |
| Octal (base 8) | 167776 |
| Hexadecimal (base 16) | EFFE |
| Base 3 | 10010021111 |
| As time | 61438 seconds = 17 h 3 min 58 s |
Is 61438 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (61438 ÷ 2 = 30719) | 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 | No (remainder 3) | 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 6) | 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 4) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 8) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 3) | 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 61438 a prime number?
No. 61438 = 2 × 13 × 17 × 139, so it is divisible by 2.
What are the factors of 61438?
1, 2, 13, 17, 26, 34, 139, 221, 278, 442, 1807, 2363, 3614, 4726, 30719, 61438.
What is 61438 in binary?
1110111111111110 (hexadecimal EFFE, octal 167776).
What is the square root of 61438?
About 247.8669.
Is 61438 divisible by 3?
No. Its digits add up to 22, which is not a multiple of 3.
What is special about the number 61438?
It is a composite number with 16 divisors.