6438369940 has 24 divisors (see below), whose sum is σ = 13524588000. Its totient is φ = 2574583968.

The previous prime is 6438369907. The next prime is 6438369947. The reversal of 6438369940 is 499638346.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6438369947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23979 + ... + 115981.

It is an arithmetic number, because the mean of its divisors is an integer number (563524500).

Almost surely, 2^6438369940 is an apocalyptic number.

It is an amenable number.

6438369940 is an abundant number, since it is smaller than the sum of its proper divisors (7086218060).

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

6438369940 is a wasteful number, since it uses less digits than its factorization.

6438369940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95511 (or 95509 counting only the distinct ones).

The product of its (nonzero) digits is 3359232, while the sum is 52.

The square root of 6438369940 is about 80239.4537618496. The cubic root of 6438369940 is about 1860.3385073963.

The spelling of 6438369940 in words is "six billion, four hundred thirty-eight million, three hundred sixty-nine thousand, nine hundred forty".