| Number: | 1234 |
1234 is the natural number following 1233, and preceding 1235. It has two distinct prime factors, 2 and 617, making it a squarefree semiprime. It is the number of independent vertex sets in a 4×4 square grid, or equivalently, the number of distinct 4×4 binary matrices in which no two adjacent elements are both equal to 1.
A 2012 study of frequently-used personal identification numbers (PIN) found that, among 4-digit PIN codes, 1234 is the most frequently chosen.[1]