809786972 has 24 divisors (see below), whose sum is σ = 1437105600. Its totient is φ = 399200256.

The previous prime is 809786969. The next prime is 809786987. The reversal of 809786972 is 279687908.

It is a congruent number.

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, 299804 + ... + 302492.

It is an arithmetic number, because the mean of its divisors is an integer number (59879400).

Almost surely, 2^809786972 is an apocalyptic number.

It is an amenable number.

809786972 is a deficient number, since it is larger than the sum of its proper divisors (627318628).

809786972 is a wasteful number, since it uses less digits than its factorization.

809786972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3725 (or 3723 counting only the distinct ones).

The product of its (nonzero) digits is 3048192, while the sum is 56.

The square root of 809786972 is about 28456.7561749402. The cubic root of 809786972 is about 932.0880251734.

The spelling of 809786972 in words is "eight hundred nine million, seven hundred eighty-six thousand, nine hundred seventy-two".