19401538194 has 24 divisors (see below), whose sum is σ = 42256760832. Its totient is φ = 6433318680.

The previous prime is 19401538187. The next prime is 19401538207. The reversal of 19401538194 is 49183510491.

19401538194 is a `hidden beast` number, since 1 + 9 + 401 + 53 + 8 + 194 = 666.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2818194 + ... + 2825069.

It is an arithmetic number, because the mean of its divisors is an integer number (1760698368).

Almost surely, 2^19401538194 is an apocalyptic number.

19401538194 is an abundant number, since it is smaller than the sum of its proper divisors (22855222638).

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

19401538194 is a wasteful number, since it uses less digits than its factorization.

19401538194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5643462 (or 5643459 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 45.

The spelling of 19401538194 in words is "nineteen billion, four hundred one million, five hundred thirty-eight thousand, one hundred ninety-four".