836

836 = 2 x 2 x 11 x 19.

836 is a weird number (abundant but not pseudoperfect) (A006037).

836 is a 17-gonal (or heptadecagonal) number: (A051869).

836 is a divisor of 45³ - 1.

836 is the number of regions made by diagonals in a regular 38-gon that are heptagons (A067154).

836 (a non-palindrome) has a palindromic square (A002778): 836² = 698896.

621,770 + 77,126 = 836² = 698896 and 621,770 - 77,126 = 738² = 544,644.

836 is the numerical equivalent of TEN on a touch-tone telephone.

Source: Number Gossip