1938191918392 has 64 divisors (see below), whose sum is σ = 3839841540000. Its totient is φ = 914624815104.

The previous prime is 1938191918371. The next prime is 1938191918417. The reversal of 1938191918392 is 2938191918391.

It is a happy number.

It is a super-2 number, since 2×1938191918392² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58629484 + ... + 58662532.

Almost surely, 2^{1938191918392} is an apocalyptic number.

It is an amenable number.

1938191918392 is a deficient number, since it is larger than the sum of its proper divisors (1901649621608).

1938191918392 is a wasteful number, since it uses less digits than its factorization.

1938191918392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34520 (or 34516 counting only the distinct ones).

The product of its digits is 7558272, while the sum is 64.

Subtracting 1938191918392 from its reverse (2938191918391), we obtain a palindrome (999999999999).

The spelling of 1938191918392 in words is "one trillion, nine hundred thirty-eight billion, one hundred ninety-one million, nine hundred eighteen thousand, three hundred ninety-two".