800391 has 4 divisors (see below), whose sum is σ = 1067192. Its totient is φ = 533592.

The previous prime is 800357. The next prime is 800399. The reversal of 800391 is 193008.

800391 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 is not a de Polignac number, because 800391 - 2¹⁵ = 767623 is a prime.

It is a D-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 (800399) 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, 133396 + ... + 133401.

It is an arithmetic number, because the mean of its divisors is an integer number (266798).

2⁸⁰⁰³⁹¹ is an apocalyptic number.

800391 is a deficient number, since it is larger than the sum of its proper divisors (266801).

800391 is a wasteful number, since it uses less digits than its factorization.

800391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266800.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 800391 is about 894.6457399440. The cubic root of 800391 is about 92.8468980526.

Adding to 800391 its reverse (193008), we get a palindrome (993399).

The spelling of 800391 in words is "eight hundred thousand, three hundred ninety-one".