684426 has 16 divisors (see below), whose sum is σ = 1406304. Its totient is φ = 221904.

The previous prime is 684419. The next prime is 684427. The reversal of 684426 is 624486.

It is a junction number, because it is equal to n+sod(n) for n = 684393 and 684402.

It is not an unprimeable number, because it can be changed into a prime (684427) by changing a digit.

684426 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, 1320 + ... + 1763.

It is an arithmetic number, because the mean of its divisors is an integer number (87894).

2⁶⁸⁴⁴²⁶ is an apocalyptic number.

684426 is an abundant number, since it is smaller than the sum of its proper divisors (721878).

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

684426 is a wasteful number, since it uses less digits than its factorization.

684426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3125.

The product of its digits is 9216, while the sum is 30.

The square root of 684426 is about 827.3004291066. The cubic root of 684426 is about 88.1269689214.

The spelling of 684426 in words is "six hundred eighty-four thousand, four hundred twenty-six".