123405

1×2×3×4×5=1201 cross 2 cross 3 cross 4 cross 5 equals 120

Have you ever looked at a number like and thought about the math hidden inside its digits? In the world of coding challenges, this number is a classic example used to teach one of the most fundamental skills in programming: Iterating through data while applying conditional logic. 123405

def checkio(number): result = 1 # Convert number to string to iterate over digits for digit in str(number): if digit != '0': result *= int(digit) return result print(checkio(123405)) # Output: 120 Use code with caution. Copied to clipboard 2. Why Skip the Zeros? 1×2×3×4×5=1201 cross 2 cross 3 cross 4 cross

The "Skip the Zero" Challenge: Mastering Digit Products in Python Copied to clipboard 2

The number is often used in coding challenges (like those on CheckiO) to teach basic algorithm logic, specifically how to calculate the product of digits while skipping zeros .

If you want to look like a Python pro, you can use a list comprehension and the math.prod function. It’s cleaner, faster, and follows the "Pythonic" way of writing code.

The easiest way to talk to each digit is to turn the number into a string. This lets us loop through it like a list of characters.