684834 has 16 divisors (see below), whose sum is σ = 1380288. Its totient is φ = 226512.

The previous prime is 684829. The next prime is 684841. The reversal of 684834 is 438486.

It is a nialpdrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 684795 and 684804.

It is an unprimeable number.

684834 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, 579 + ... + 1305.

It is an arithmetic number, because the mean of its divisors is an integer number (86268).

2⁶⁸⁴⁸³⁴ is an apocalyptic number.

684834 is an abundant number, since it is smaller than the sum of its proper divisors (695454).

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

684834 is a wasteful number, since it uses less digits than its factorization.

684834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 889.

The product of its digits is 18432, while the sum is 33.

The square root of 684834 is about 827.5469775185. The cubic root of 684834 is about 88.1444768579.

Multiplying 684834 by its sum of digits (33), we get a palindrome (22599522).

The spelling of 684834 in words is "six hundred eighty-four thousand, eight hundred thirty-four".