4459

4459 = 7 x 7 x 7 x 13.

4459 divides 18¹² - 1.

4459 is a number having exactly four representations by the quadratic form x² + xy + y² with 0 less than or equal to x less than or equal to y (A198775).

4459 is the number of Ramanujan primes less than 100,000 (A181671).

Source: OEIS