865

865 = 5 x 173.

865 has two representations as a sum of two squares: 865 = 9² + 28² = 17² + 24².

865 is the hypotenuse of two primitive Pythagorean triples: 865² = 287² + 816² = 504² + 703².

865 is 717 in base 11 and 151 in base 27.

865 is the sum of distinct factorials (A059590): 865 = 6! + 5! + 4! + 1!

Source: On-Line Encyclopedia of Integer Sequences