819394424 has 32 divisors (see below), whose sum is σ = 1632370320. Its totient is φ = 384262656.

The previous prime is 819394423. The next prime is 819394447. The reversal of 819394424 is 424493918.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (819394423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29567 + ... + 50129.

Almost surely, 2^819394424 is an apocalyptic number.

It is an amenable number.

819394424 is a deficient number, since it is larger than the sum of its proper divisors (812975896).

819394424 is a wasteful number, since it uses less digits than its factorization.

819394424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20879 (or 20875 counting only the distinct ones).

The product of its digits is 248832, while the sum is 44.

The square root of 819394424 is about 28625.0663580017. The cubic root of 819394424 is about 935.7596937094.

The spelling of 819394424 in words is "eight hundred nineteen million, three hundred ninety-four thousand, four hundred twenty-four".