1898

1898 = 2 x 13 x 73.

1898 is 1122 in base 12 (A033010). It is 868 in base 15.

1898 is the smallest multiple of 26 whose digits sum to 26 (A002998).

1898 is the number of primes between 26² and 26³ (A079648).

1898 is the least positive integer that can be represented as the sum of a semiprime and a square in exactly 25 ways (A101181).

1898 has two representations as a sum of two squares: 1898 = 7² + 43² = 23² + 37². It is the sum of two squared primes in exactly two ways (A226539).

1898 divides 81³ - 1.

Source: OEIS