819397804 has 12 divisors (see below), whose sum is σ = 1446636744. Its totient is φ = 406073024.

The previous prime is 819397759. The next prime is 819397867. The reversal of 819397804 is 408793918.

It is a happy number.

It is a super-2 number, since 2×819397804² = 1342825522400044832, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 905962 + ... + 906865.

It is an arithmetic number, because the mean of its divisors is an integer number (120553062).

Almost surely, 2^819397804 is an apocalyptic number.

It is an amenable number.

819397804 is a deficient number, since it is larger than the sum of its proper divisors (627238940).

819397804 is a wasteful number, since it uses less digits than its factorization.

819397804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1812944 (or 1812942 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 49.

The square root of 819397804 is about 28625.1253971053. The cubic root of 819397804 is about 935.7609803764.

The spelling of 819397804 in words is "eight hundred nineteen million, three hundred ninety-seven thousand, eight hundred four".