873

873 = 3 x 3 x 97.

873 = 1! + 2! + 3! + 4! + 5! + 6! (A007489).

873 is 1551 in base 8. It is 369 in base 16.

873 is the solution to the postage stamp problem for four denominations and 13 stamps (A001209).

873 is a number n such that 4n - 1, 8n - 1, and 16n - 1 are primes (A101790).

873 has a representation as a sum of two squares: 873 = 12² + 27².

873 is a divisor of 98² - 1.

Source: What's Special About This Number?