18723638196 has 36 divisors (see below), whose sum is σ = 47439048384. Its totient is φ = 6226726800.

The previous prime is 18723638191. The next prime is 18723638209. The reversal of 18723638196 is 69183632781.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18723638191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 587850 + ... + 618881.

It is an arithmetic number, because the mean of its divisors is an integer number (1317751344).

Almost surely, 2^18723638196 is an apocalyptic number.

It is an amenable number.

18723638196 is an abundant number, since it is smaller than the sum of its proper divisors (28715410188).

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

18723638196 is a wasteful number, since it uses less digits than its factorization.

18723638196 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1207172 (or 1207167 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 54.

The spelling of 18723638196 in words is "eighteen billion, seven hundred twenty-three million, six hundred thirty-eight thousand, one hundred ninety-six".