840804 has 12 divisors (see below), whose sum is σ = 1961904. Its totient is φ = 280264.

The previous prime is 840767. The next prime is 840817. The reversal of 840804 is 408048.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35022 + ... + 35045.

It is an arithmetic number, because the mean of its divisors is an integer number (163492).

2⁸⁴⁰⁸⁰⁴ is an apocalyptic number.

It is an amenable number.

840804 is an abundant number, since it is smaller than the sum of its proper divisors (1121100).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

840804 is a wasteful number, since it uses less digits than its factorization.

840804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70074 (or 70072 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 24.

The square root of 840804 is about 916.9536520457. The cubic root of 840804 is about 94.3839733877.

The spelling of 840804 in words is "eight hundred forty thousand, eight hundred four".