840504 has 32 divisors (see below), whose sum is σ = 2401920. Its totient is φ = 240096.

The previous prime is 840491. The next prime is 840523. The reversal of 840504 is 405048.

840504 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (21).

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 840504.

It is an unprimeable number.

840504 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2334 + ... + 2669.

It is an arithmetic number, because the mean of its divisors is an integer number (75060).

2⁸⁴⁰⁵⁰⁴ is an apocalyptic number.

840504 is a gapful number since it is divisible by the number (84) formed by its first and last digit.

It is an amenable number.

840504 is an abundant number, since it is smaller than the sum of its proper divisors (1561416).

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

840504 is a wasteful number, since it uses less digits than its factorization.

840504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5019 (or 5015 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 840504 is about 916.7900523021. The cubic root of 840504 is about 94.3727466094.

The spelling of 840504 in words is "eight hundred forty thousand, five hundred four".