684329839 has 4 divisors (see below), whose sum is σ = 684758880. Its totient is φ = 683900800.

The previous prime is 684329831. The next prime is 684329851. The reversal of 684329839 is 938923486.

684329839 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 684329839 - 2³ = 684329831 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684329831) 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, 212119 + ... + 215320.

It is an arithmetic number, because the mean of its divisors is an integer number (171189720).

Almost surely, 2^684329839 is an apocalyptic number.

684329839 is a deficient number, since it is larger than the sum of its proper divisors (429041).

684329839 is a wasteful number, since it uses less digits than its factorization.

684329839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429040.

The product of its digits is 2239488, while the sum is 52.

The square root of 684329839 is about 26159.6987559108. The cubic root of 684329839 is about 881.2284148495.

The spelling of 684329839 in words is "six hundred eighty-four million, three hundred twenty-nine thousand, eight hundred thirty-nine".