18381938212 has 12 divisors (see below), whose sum is σ = 35092791216. Its totient is φ = 8355426440.

The previous prime is 18381938161. The next prime is 18381938221. The reversal of 18381938212 is 21283918381.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 208885618 + ... + 208885705.

It is an arithmetic number, because the mean of its divisors is an integer number (2924399268).

Almost surely, 2^18381938212 is an apocalyptic number.

It is an amenable number.

18381938212 is a deficient number, since it is larger than the sum of its proper divisors (16710853004).

18381938212 is a wasteful number, since it uses less digits than its factorization.

18381938212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417771338 (or 417771336 counting only the distinct ones).

The product of its digits is 165888, while the sum is 46.

The spelling of 18381938212 in words is "eighteen billion, three hundred eighty-one million, nine hundred thirty-eight thousand, two hundred twelve".