805939 has 4 divisors (see below), whose sum is σ = 833760. Its totient is φ = 778120.

The previous prime is 805933. The next prime is 805967. The reversal of 805939 is 939508.

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

It is a cyclic number.

It is not a de Polignac number, because 805939 - 2⁷ = 805811 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (805933) 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, 13867 + ... + 13924.

It is an arithmetic number, because the mean of its divisors is an integer number (208440).

2⁸⁰⁵⁹³⁹ is an apocalyptic number.

805939 is a deficient number, since it is larger than the sum of its proper divisors (27821).

805939 is a wasteful number, since it uses less digits than its factorization.

805939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27820.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 805939 is about 897.7410539794. The cubic root of 805939 is about 93.0609305114.

The spelling of 805939 in words is "eight hundred five thousand, nine hundred thirty-nine".