684039 has 4 divisors (see below), whose sum is σ = 912056. Its totient is φ = 456024.

The previous prime is 684037. The next prime is 684053. The reversal of 684039 is 930486.

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

It is not a de Polignac number, because 684039 - 2¹ = 684037 is a prime.

It is a D-number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 683997 and 684015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684037) 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, 114004 + ... + 114009.

It is an arithmetic number, because the mean of its divisors is an integer number (228014).

2⁶⁸⁴⁰³⁹ is an apocalyptic number.

684039 is a deficient number, since it is larger than the sum of its proper divisors (228017).

684039 is a wasteful number, since it uses less digits than its factorization.

684039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228016.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 684039 is about 827.0665027675. The cubic root of 684039 is about 88.1103556975.

The spelling of 684039 in words is "six hundred eighty-four thousand, thirty-nine".