805806 has 24 divisors (see below), whose sum is σ = 1769040. Its totient is φ = 265056.

The previous prime is 805799. The next prime is 805807. The reversal of 805806 is 608508.

805806 is a `hidden beast` number, since 80 + 580 + 6 = 666.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 805806.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 805806.

It is not an unprimeable number, because it can be changed into a prime (805807) by changing a digit.

805806 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 11 ways as a sum of consecutive naturals, for example, 1351 + ... + 1853.

It is an arithmetic number, because the mean of its divisors is an integer number (73710).

2⁸⁰⁵⁸⁰⁶ is an apocalyptic number.

805806 is an abundant number, since it is smaller than the sum of its proper divisors (963234).

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

805806 is a wasteful number, since it uses less digits than its factorization.

805806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 600 (or 597 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 805806 is about 897.6669761109. Note that the first 3 decimals coincide. The cubic root of 805806 is about 93.0558111063.

It can be divided in two parts, 80 and 5806, that added together give a triangular number (5886 = T₁₀₈).

The spelling of 805806 in words is "eight hundred five thousand, eight hundred six".