804391 has 4 divisors (see below), whose sum is σ = 919312. Its totient is φ = 689472.

The previous prime is 804383. The next prime is 804409. The reversal of 804391 is 193408.

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

It is not a de Polignac number, because 804391 - 2³ = 804383 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 (804341) 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, 57450 + ... + 57463.

It is an arithmetic number, because the mean of its divisors is an integer number (229828).

2⁸⁰⁴³⁹¹ is an apocalyptic number.

804391 is a deficient number, since it is larger than the sum of its proper divisors (114921).

804391 is a wasteful number, since it uses less digits than its factorization.

804391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114920.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 804391 is about 896.8784756030. The cubic root of 804391 is about 93.0013103450.

Adding to 804391 its reverse (193408), we get a palindrome (997799).

The spelling of 804391 in words is "eight hundred four thousand, three hundred ninety-one".