819928422 has 12 divisors (see below), whose sum is σ = 1776511620. Its totient is φ = 273309468.

The previous prime is 819928321. The next prime is 819928427. The reversal of 819928422 is 224829918.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (819928427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22775772 + ... + 22775807.

It is an arithmetic number, because the mean of its divisors is an integer number (148042635).

Almost surely, 2^819928422 is an apocalyptic number.

819928422 is an abundant number, since it is smaller than the sum of its proper divisors (956583198).

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

819928422 is a wasteful number, since it uses less digits than its factorization.

819928422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45551587 (or 45551584 counting only the distinct ones).

The product of its digits is 165888, while the sum is 45.

The square root of 819928422 is about 28634.3922931848. The cubic root of 819928422 is about 935.9629272518.

The spelling of 819928422 in words is "eight hundred nineteen million, nine hundred twenty-eight thousand, four hundred twenty-two".