[Python] Find Perfect Number using While loop in Python

There is no error in this code but its not printing the result. Here, what could be the problem.

# Using WHILE LOOP
num = int(input('Enter any positive integer: '))
sum1 = 0
i = 1

if num <= 0:
print('Invalid Number.')
else:
while(i < num):
if num % i == 0:
sum1 = sum1 + i
i = i + 1

if sum1 == num:
print(num, "is a perfect number")
else:
print(num, "is not a perfect number")

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