684318 has 16 divisors (see below), whose sum is σ = 1449360. Its totient is φ = 214656.

The previous prime is 684311. The next prime is 684329. The reversal of 684318 is 813486.

It is a happy number.

684318 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×684318² = 936582250248, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3253 + ... + 3456.

It is an arithmetic number, because the mean of its divisors is an integer number (90585).

2⁶⁸⁴³¹⁸ is an apocalyptic number.

684318 is an abundant number, since it is smaller than the sum of its proper divisors (765042).

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

684318 is a wasteful number, since it uses less digits than its factorization.

684318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6731.

The product of its digits is 4608, while the sum is 30.

The square root of 684318 is about 827.2351539919. The cubic root of 684318 is about 88.1223333029.

The spelling of 684318 in words is "six hundred eighty-four thousand, three hundred eighteen".