819194138 has 16 divisors (see below), whose sum is σ = 1404708480. Its totient is φ = 350989296.

The previous prime is 819194111. The next prime is 819194141. The reversal of 819194138 is 831491918.

819194138 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 81683 + ... + 91161.

It is an arithmetic number, because the mean of its divisors is an integer number (87794280).

Almost surely, 2^819194138 is an apocalyptic number.

819194138 is a deficient number, since it is larger than the sum of its proper divisors (585514342).

819194138 is a wasteful number, since it uses less digits than its factorization.

819194138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15661.

The product of its digits is 62208, while the sum is 44.

The square root of 819194138 is about 28621.5677068885. The cubic root of 819194138 is about 935.6834443749.

The spelling of 819194138 in words is "eight hundred nineteen million, one hundred ninety-four thousand, one hundred thirty-eight".