684838 has 16 divisors (see below), whose sum is σ = 1281024. Its totient is φ = 266760.

The previous prime is 684829. The next prime is 684841. The reversal of 684838 is 838486.

684838 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 684797 and 684806.

It is a congruent number.

It is an unprimeable number.

684838 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, 2070 + ... + 2377.

It is an arithmetic number, because the mean of its divisors is an integer number (80064).

2⁶⁸⁴⁸³⁸ is an apocalyptic number.

684838 is a deficient number, since it is larger than the sum of its proper divisors (596186).

684838 is a wasteful number, since it uses less digits than its factorization.

684838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4467.

The product of its digits is 36864, while the sum is 37.

The square root of 684838 is about 827.5493942962. The cubic root of 684838 is about 88.1446484700.

It can be divided in two parts, 6848 and 38, that added together give a palindrome (6886).

The spelling of 684838 in words is "six hundred eighty-four thousand, eight hundred thirty-eight".