805866 has 16 divisors (see below), whose sum is σ = 1696800. Its totient is φ = 254448.

The previous prime is 805859. The next prime is 805867. The reversal of 805866 is 668508.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 805866.

It is not an unprimeable number, because it can be changed into a prime (805867) by changing a digit.

805866 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3421 + ... + 3648.

It is an arithmetic number, because the mean of its divisors is an integer number (106050).

2⁸⁰⁵⁸⁶⁶ is an apocalyptic number.

805866 is an abundant number, since it is smaller than the sum of its proper divisors (890934).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

805866 is a wasteful number, since it uses less digits than its factorization.

805866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7093.

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 805866 is about 897.7003954550. The cubic root of 805866 is about 93.0581206821.

The spelling of 805866 in words is "eight hundred five thousand, eight hundred sixty-six".