What are the divisors of 5897?

1, 5897

There is a total of 2 positive divisors.
The sum of these divisors is 5898.
The arithmetic mean is 2949.

2 odd divisors

1, 5897

How to compute the divisors of 5897?

A number N is said to be divisible by a number M (with M non-zero) if, when we divide N by M, the remainder of the division is zero.

$N mod M = 0$

Brute force algorithm

We could start by using a brute-force method which would involve dividing 5897 by each of the numbers from 1 to 5897 to determine which ones have a remainder equal to 0.

$Remainder = N - (M \times ⌊ \frac{N}{M} ⌋)$

(where $⌊ \frac{N}{M} ⌋$ is the integer part of the quotient)

5897 / 1 = 5897 (the remainder is 0, so 1 is a divisor of 5897)
5897 / 2 = 2948.5 (the remainder is 1, so 2 is not a divisor of 5897)
5897 / 3 = 1965.6666666667 (the remainder is 2, so 3 is not a divisor of 5897)
...
5897 / 5896 = 1.0001696065129 (the remainder is 1, so 5896 is not a divisor of 5897)
5897 / 5897 = 1 (the remainder is 0, so 5897 is a divisor of 5897)

Improved algorithm using square-root

However, there is another slightly better approach that reduces the number of iterations by testing only integers less than or equal to the square root of 5897 (i.e. 76.791926658992). Indeed, if a number N has a divisor D greater than its square root, then there is necessarily a smaller divisor d such that:

$D \times d = N$

(thus, if $\frac{N}{D} = d$ , then $\frac{N}{d} = D$ )

5897 / 1 = 5897 (the remainder is 0, so 1 and 5897 are divisors of 5897)
5897 / 2 = 2948.5 (the remainder is 1, so 2 is not a divisor of 5897)
5897 / 3 = 1965.6666666667 (the remainder is 2, so 3 is not a divisor of 5897)
...
5897 / 75 = 78.626666666667 (the remainder is 47, so 75 is not a divisor of 5897)
5897 / 76 = 77.592105263158 (the remainder is 45, so 76 is not a divisor of 5897)