Whether a number is perfect number or not

#include<stdio.h>
int main()
{
    int n,i,sum=0;
    printf("Enter the number:");
    scanf("%d", &n);
    for (i=1; i<n; i++)
    {
        if(n%i==0)
        {
            sum=sum+i;
        }
    }
    if (sum==n)
        printf("It's a perfect number\n");
    else
        printf("It's not a perfect number\n");
    return 0;
}