684404 has 12 divisors (see below), whose sum is σ = 1368864. Its totient is φ = 293304.

The previous prime is 684379. The next prime is 684407. The reversal of 684404 is 404486.

684404 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

684404 is an admirable number.

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684407) 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, 12194 + ... + 12249.

It is an arithmetic number, because the mean of its divisors is an integer number (114072).

2⁶⁸⁴⁴⁰⁴ is an apocalyptic number.

It is an amenable number.

684404 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

684404 is a wasteful number, since it uses less digits than its factorization.

684404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24454 (or 24452 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 26.

The square root of 684404 is about 827.2871327417. The cubic root of 684404 is about 88.1260246683.

The spelling of 684404 in words is "six hundred eighty-four thousand, four hundred four".