1938208389609 has 32 divisors (see below), whose sum is σ = 2738969671680. Its totient is φ = 1216584940032.

The previous prime is 1938208389589. The next prime is 1938208389631. The reversal of 1938208389609 is 9069838028391.

It is not a de Polignac number, because 1938208389609 - 2⁵ = 1938208389577 is a prime.

It is a Smith number, since the sum of its digits (66) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 1938208389609.

It is not an unprimeable number, because it can be changed into a prime (1938208389709) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5938809 + ... + 6256665.

It is an arithmetic number, because the mean of its divisors is an integer number (85592802240).

Almost surely, 2^{1938208389609} is an apocalyptic number.

It is an amenable number.

1938208389609 is a deficient number, since it is larger than the sum of its proper divisors (800761282071).

1938208389609 is a wasteful number, since it uses less digits than its factorization.

1938208389609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319269.

The product of its (nonzero) digits is 40310784, while the sum is 66.

The spelling of 1938208389609 in words is "one trillion, nine hundred thirty-eight billion, two hundred eight million, three hundred eighty-nine thousand, six hundred nine".