819395994 has 16 divisors (see below), whose sum is σ = 1639078560. Its totient is φ = 273084240.

The previous prime is 819395963. The next prime is 819396001. The reversal of 819395994 is 499593918.

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, 49752 + ... + 64140.

It is an arithmetic number, because the mean of its divisors is an integer number (102442410).

Almost surely, 2^819395994 is an apocalyptic number.

819395994 is an abundant number, since it is smaller than the sum of its proper divisors (819682566).

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

819395994 is a wasteful number, since it uses less digits than its factorization.

819395994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23885.

The product of its digits is 3149280, while the sum is 57.

The square root of 819395994 is about 28625.0937815058. The cubic root of 819395994 is about 935.7602913628.

The spelling of 819395994 in words is "eight hundred nineteen million, three hundred ninety-five thousand, nine hundred ninety-four".