805685 has 4 divisors (see below), whose sum is σ = 966828. Its totient is φ = 644544.

The previous prime is 805639. The next prime is 805687. The reversal of 805685 is 586508.

805685 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 568516 + 237169 = 754^2 + 487^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-805685 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (805687) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80564 + ... + 80573.

It is an arithmetic number, because the mean of its divisors is an integer number (241707).

2⁸⁰⁵⁶⁸⁵ is an apocalyptic number.

It is an amenable number.

805685 is a deficient number, since it is larger than the sum of its proper divisors (161143).

805685 is a wasteful number, since it uses less digits than its factorization.

805685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161142.

The product of its (nonzero) digits is 9600, while the sum is 32.

The square root of 805685 is about 897.5995766487. The cubic root of 805685 is about 93.0511531130.

The spelling of 805685 in words is "eight hundred five thousand, six hundred eighty-five".