809688842 has 16 divisors (see below), whose sum is σ = 1227025800. Its totient is φ = 400688640.

The previous prime is 809688823. The next prime is 809688911. The reversal of 809688842 is 248886908.

It can be written as a sum of positive squares in 4 ways, for example, as 785176441 + 24512401 = 28021^2 + 4951^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 295334 + ... + 298062.

Almost surely, 2^809688842 is an apocalyptic number.

809688842 is a deficient number, since it is larger than the sum of its proper divisors (417336958).

809688842 is a wasteful number, since it uses less digits than its factorization.

809688842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4201.

The product of its (nonzero) digits is 1769472, while the sum is 53.

The square root of 809688842 is about 28455.0319275871. The cubic root of 809688842 is about 932.0503735046.

The spelling of 809688842 in words is "eight hundred nine million, six hundred eighty-eight thousand, eight hundred forty-two".