The number 71438
71438 is a composite number with 8 divisors. Its prime factorisation is 2 × 23 × 1553. Divisors (8): 1, 2, 23, 46, 1553, 3106, 35719, 71438.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 71438: a happy number: repeatedly adding the squares of its digits reaches 1; a Harshad number: divisible by its digit sum 23.
- 2
71438 is composite. Its prime factorisation is
- 3
The divisors add up to 111888; without 71438 itself that is 40450, so 71438 is deficient (40450 is less than 71438). Euler's totient φ(71438) = 34144 numbers up to 71438 share no factor with it.
- 4
The digits of 71438 add up to 23, and repeating that until one digit is left gives the digital root 5. The Collatz sequence (halve if even, else 3n+1) takes 99 steps to reach 1.
LaTeX source of the formulas on this page
\[ 71438 = 2 \times 23 \times 1553 \]
71438 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 111888 |
| Euler totient φ(n) | 34144 |
| Square | 5103387844 |
| Cube | 364575820799672 |
| Square root | 267.278881 |
| Digit sum / digital root | 23 / 5 |
| Collatz steps to 1 | 99 |
| Scientific notation | 7.1438 × |
71438 in other forms
| Form | Value |
|---|---|
| In words | seventy-one thousand four hundred and thirty-eight |
| Binary (base 2) | 10001011100001110 |
| Octal (base 8) | 213416 |
| Hexadecimal (base 16) | 1170E |
| Base 3 | 10121222212 |
| As time | 71438 seconds = 19 h 50 min 38 s |
Is 71438 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (71438 ÷ 2 = 35719) | 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 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 2) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 3) | 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 5) | 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 4) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 2) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 71438 a prime number?
No. 71438 = 2 × 23 × 1553, so it is divisible by 2.
What are the factors of 71438?
1, 2, 23, 46, 1553, 3106, 35719, 71438.
What is 71438 in binary?
10001011100001110 (hexadecimal 1170E, octal 213416).
What is the square root of 71438?
About 267.2789.
Is 71438 divisible by 3?
No. Its digits add up to 23, which is not a multiple of 3.
What is special about the number 71438?
71438 is a happy number: repeatedly adding the squares of its digits reaches 1; a Harshad number: divisible by its digit sum 23.