840304 has 20 divisors (see below), whose sum is σ = 1685160. Its totient is φ = 405440.

The previous prime is 840299. The next prime is 840319. The reversal of 840304 is 403048.

It is a super-2 number, since 2×840304² = 1412221624832, which contains 22 as substring.

It is a congruent number.

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, 442 + ... + 1369.

It is an arithmetic number, because the mean of its divisors is an integer number (84258).

2⁸⁴⁰³⁰⁴ is an apocalyptic number.

It is an amenable number.

840304 is an abundant number, since it is smaller than the sum of its proper divisors (844856).

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

840304 is a wasteful number, since it uses less digits than its factorization.

840304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1848 (or 1842 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 840304 is about 916.6809695854. The cubic root of 840304 is about 94.3652606063.

The spelling of 840304 in words is "eight hundred forty thousand, three hundred four".