123 (number)

123 is the natural number following 122 and preceding 124.

In mathematics

123 is a Lucas number. It is the eleventh member of the Mian–Chowla sequence.
Along with 6, 123 is one of only two positive integers that is simultaneously two more than a perfect square and two less than a perfect cube.
123 is the first whole number containing numbers from 1 to 3.

In religion

In numerology, the sequence of 123 is associated with progress and the Holy Trinity, so it may be referred to as the Trinity of Progress or Triad of Progress.