5415 = 3 x 5 x 19 x 19.
5415 is a number n such that n and its reversal (5145) are both multiples of 15 (A062905).
5415 is a number n such that the sum of the digits of n equals the squarefree part of n (A070274).
5415 is the smallest number n such that 2n + 1, 4n + 1, 6n + 1, 8n + 1, and 10n + 1 are all prime numbers (A124410).
5415 is a number that cannot be written as a sum of three squares.
5415 is a divisor of 6812 - 1.
Source: On-Line Encyclopedia of Integer Sequences