123456

The numeral 123456 is a six-digit decimal number. It is equal to one hundred twenty-three thousand four hundred fifty-six. In the number line, it follows 123455 and precedes 123457.

In mathematics, 123456 factorization is 2^6 * 3 * 643. The digits are a consecutive sequence from 1 to 6, which makes it a common example of a number with a simple digit pattern.

In computing and cybersecurity, 123456 is widely used as a weak password or PIN. It has appeared repeatedly near the top of lists of most common passwords in security research and data breaches, often cited as an example of insecure credential choices. Security best practices discourage its use, recommending longer, unique passwords and multi-factor authentication.

In data presentation and testing, 123456 is sometimes used as a placeholder or sample data because of its simple, easily remembered pattern. It also appears in demonstrations, software testing, and numerical examples where a six-digit number is required.