684616839 has 16 divisors (see below), whose sum is σ = 920828160. Its totient is φ = 452419200.

The previous prime is 684616837. The next prime is 684616853. The reversal of 684616839 is 938616486.

684616839 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 684616839 - 2¹ = 684616837 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 684616791 and 684616800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684616831) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 500134 + ... + 501500.

It is an arithmetic number, because the mean of its divisors is an integer number (57551760).

Almost surely, 2^684616839 is an apocalyptic number.

684616839 is a deficient number, since it is larger than the sum of its proper divisors (236211321).

684616839 is a wasteful number, since it uses less digits than its factorization.

684616839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2710.

The product of its digits is 1492992, while the sum is 51.

The square root of 684616839 is about 26165.1837180632. The cubic root of 684616839 is about 881.3515899583.

The spelling of 684616839 in words is "six hundred eighty-four million, six hundred sixteen thousand, eight hundred thirty-nine".