809841812 has 24 divisors (see below), whose sum is σ = 1530883872. Its totient is φ = 372636000.

The previous prime is 809841811. The next prime is 809841817. The reversal of 809841812 is 218148908.

It is a self number, because there is not a number n which added to its sum of digits gives 809841812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (809841811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6314 + ... + 40737.

It is an arithmetic number, because the mean of its divisors is an integer number (63786828).

Almost surely, 2^809841812 is an apocalyptic number.

It is an amenable number.

809841812 is a deficient number, since it is larger than the sum of its proper divisors (721042060).

809841812 is a wasteful number, since it uses less digits than its factorization.

809841812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47399 (or 47397 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 41.

The square root of 809841812 is about 28457.7197259373. The cubic root of 809841812 is about 932.1090655026.

The spelling of 809841812 in words is "eight hundred nine million, eight hundred forty-one thousand, eight hundred twelve".