819816 has 16 divisors (see below), whose sum is σ = 2049600. Its totient is φ = 273264.

The previous prime is 819811. The next prime is 819823. The reversal of 819816 is 618918.

It is not an unprimeable number, because it can be changed into a prime (819811) by changing a digit.

819816 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17056 + ... + 17103.

It is an arithmetic number, because the mean of its divisors is an integer number (128100).

2⁸¹⁹⁸¹⁶ is an apocalyptic number.

It is an amenable number.

819816 is an abundant number, since it is smaller than the sum of its proper divisors (1229784).

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

819816 is a wasteful number, since it uses less digits than its factorization.

819816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34168 (or 34164 counting only the distinct ones).

The product of its digits is 3456, while the sum is 33.

The square root of 819816 is about 905.4369111098. The cubic root of 819816 is about 93.5920148057.

The spelling of 819816 in words is "eight hundred nineteen thousand, eight hundred sixteen".