27459 is a member of OEIS A052018: numbers k with the property that the sum of the digits of k is a substring of k, here the sum of the digits is 27. See entry for 27387.

27459 is a Harshad number.

27459 can be rendered as a digit equation as follows:

2 + 7 = (-4 + 5) * 9

27459 stabilises after about 1770 generations of Conway's Gameof Life to at least seven gliders and a wide variety of still life shapes and oscillators.