6840639388 has 48 divisors (see below), whose sum is σ = 13920883200. Its totient is φ = 2908414080.

The previous prime is 6840639371. The next prime is 6840639389. The reversal of 6840639388 is 8839360486.

It is a happy number.

It is a Smith number, since the sum of its digits (55) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6840639389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14256 + ... + 117832.

It is an arithmetic number, because the mean of its divisors is an integer number (290018400).

Almost surely, 2^6840639388 is an apocalyptic number.

It is an amenable number.

6840639388 is an abundant number, since it is smaller than the sum of its proper divisors (7080243812).

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

6840639388 is a wasteful number, since it uses less digits than its factorization.

6840639388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103690 (or 103688 counting only the distinct ones).

The product of its (nonzero) digits is 5971968, while the sum is 55.

The square root of 6840639388 is about 82708.1579289492. The cubic root of 6840639388 is about 1898.3031376396.

The spelling of 6840639388 in words is "six billion, eight hundred forty million, six hundred thirty-nine thousand, three hundred eighty-eight".