684331 has 4 divisors (see below), whose sum is σ = 701064. Its totient is φ = 667600.

The previous prime is 684329. The next prime is 684337. The reversal of 684331 is 133486.

684331 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 684331 - 2¹ = 684329 is a prime.

It is a super-2 number, since 2×684331² = 936617835122, which contains 22 as substring.

It is a Duffinian number.

684331 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 684296 and 684305.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684337) 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, 8305 + ... + 8386.

It is an arithmetic number, because the mean of its divisors is an integer number (175266).

2⁶⁸⁴³³¹ is an apocalyptic number.

684331 is a deficient number, since it is larger than the sum of its proper divisors (16733).

684331 is a wasteful number, since it uses less digits than its factorization.

684331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16732.

The product of its digits is 1728, while the sum is 25.

The square root of 684331 is about 827.2430114543. The cubic root of 684331 is about 88.1228913199.

The spelling of 684331 in words is "six hundred eighty-four thousand, three hundred thirty-one".