18193920038 has 16 divisors (see below), whose sum is σ = 31274571264. Its totient is φ = 7776145800.

The previous prime is 18193919971. The next prime is 18193920077. The reversal of 18193920038 is 83002939181.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1765388 + ... + 1775663.

It is an arithmetic number, because the mean of its divisors is an integer number (1954660704).

Almost surely, 2^18193920038 is an apocalyptic number.

18193920038 is a deficient number, since it is larger than the sum of its proper divisors (13080651226).

18193920038 is a wasteful number, since it uses less digits than its factorization.

18193920038 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3541427.

The product of its (nonzero) digits is 93312, while the sum is 44.

The spelling of 18193920038 in words is "eighteen billion, one hundred ninety-three million, nine hundred twenty thousand, thirty-eight".