819199998 has 12 divisors (see below), whose sum is σ = 1774933368. Its totient is φ = 273066660.

The previous prime is 819199973. The next prime is 819200003. The reversal of 819199998 is 899991918.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22755538 + ... + 22755573.

It is an arithmetic number, because the mean of its divisors is an integer number (147911114).

Almost surely, 2^819199998 is an apocalyptic number.

819199998 is an abundant number, since it is smaller than the sum of its proper divisors (955733370).

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

819199998 is a wasteful number, since it uses less digits than its factorization.

819199998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45511119 (or 45511116 counting only the distinct ones).

The product of its digits is 3779136, while the sum is 63.

The square root of 819199998 is about 28621.6700770587. The cubic root of 819199998 is about 935.6856754667.

The spelling of 819199998 in words is "eight hundred nineteen million, one hundred ninety-nine thousand, nine hundred ninety-eight".