819920812 has 48 divisors (see below), whose sum is σ = 1567151712. Its totient is φ = 373867520.

The previous prime is 819920753. The next prime is 819920821. The reversal of 819920812 is 218029918.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 297762 + ... + 300502.

It is an arithmetic number, because the mean of its divisors is an integer number (32648994).

Almost surely, 2^819920812 is an apocalyptic number.

It is an amenable number.

819920812 is a deficient number, since it is larger than the sum of its proper divisors (747230900).

819920812 is a wasteful number, since it uses less digits than its factorization.

819920812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2898 (or 2896 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 40.

The square root of 819920812 is about 28634.2594107129. The cubic root of 819920812 is about 935.9600315926.

The spelling of 819920812 in words is "eight hundred nineteen million, nine hundred twenty thousand, eight hundred twelve".