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
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