805391 has 12 divisors (see below), whose sum is σ = 896112. Its totient is φ = 722304.

The previous prime is 805381. The next prime is 805397. The reversal of 805391 is 193508.

It is not a de Polignac number, because 805391 - 2⁶ = 805327 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 805391.

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 805391.

It is not an unprimeable number, because it can be changed into a prime (805397) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8255 + ... + 8351.

It is an arithmetic number, because the mean of its divisors is an integer number (74676).

2⁸⁰⁵³⁹¹ is an apocalyptic number.

805391 is a deficient number, since it is larger than the sum of its proper divisors (90721).

805391 is a wasteful number, since it uses less digits than its factorization.

805391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158 (or 139 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 805391 is about 897.4357915751. The cubic root of 805391 is about 93.0398334007.

Adding to 805391 its reverse (193508), we get a palindrome (998899).

The spelling of 805391 in words is "eight hundred five thousand, three hundred ninety-one".