805805 has 48 divisors (see below), whose sum is σ = 1378944. Its totient is φ = 443520.

The previous prime is 805799. The next prime is 805807. The reversal of 805805 is 508508.

It is not a de Polignac number, because 805805 - 2⁴ = 805789 is a prime.

It is an Ulam number.

It is a congruent number.

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

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 47 ways as a sum of consecutive naturals, for example, 35024 + ... + 35046.

It is an arithmetic number, because the mean of its divisors is an integer number (28728).

2⁸⁰⁵⁸⁰⁵ is an apocalyptic number.

It is an amenable number.

805805 is a deficient number, since it is larger than the sum of its proper divisors (573139).

805805 is a wasteful number, since it uses less digits than its factorization.

805805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66 (or 59 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 26.

The square root of 805805 is about 897.6664191112. Note that the first 3 decimals coincide. The cubic root of 805805 is about 93.0557726124.

It can be divided in two parts, 80 and 5805, that added together give a palindrome (5885).

The spelling of 805805 in words is "eight hundred five thousand, eight hundred five".