6438389594 has 24 divisors (see below), whose sum is σ = 12098514708. Its totient is φ = 2547054720.

The previous prime is 6438389593. The next prime is 6438389599. The reversal of 6438389594 is 4959838346.

It can be written as a sum of positive squares in 2 ways, for example, as 6434125369 + 4264225 = 80213^2 + 2065^2 .

It is not an unprimeable number, because it can be changed into a prime (6438389591) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2525567 + ... + 2528114.

Almost surely, 2^6438389594 is an apocalyptic number.

6438389594 is a deficient number, since it is larger than the sum of its proper divisors (5660125114).

6438389594 is a wasteful number, since it uses less digits than its factorization.

6438389594 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5053710 (or 5053703 counting only the distinct ones).

The product of its digits is 22394880, while the sum is 59.

The square root of 6438389594 is about 80239.5762326796. The cubic root of 6438389594 is about 1860.3404003731.

The spelling of 6438389594 in words is "six billion, four hundred thirty-eight million, three hundred eighty-nine thousand, five hundred ninety-four".