809666842 has 8 divisors (see below), whose sum is σ = 1215011232. Its totient is φ = 404663100.

The previous prime is 809666833. The next prime is 809666867. The reversal of 809666842 is 248666908.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79134 + ... + 88777.

It is an arithmetic number, because the mean of its divisors is an integer number (151876404).

Almost surely, 2^809666842 is an apocalyptic number.

809666842 is a deficient number, since it is larger than the sum of its proper divisors (405344390).

809666842 is a wasteful number, since it uses less digits than its factorization.

809666842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170324.

The product of its (nonzero) digits is 995328, while the sum is 49.

The square root of 809666842 is about 28454.6453501006. The cubic root of 809666842 is about 932.0419318692.

The spelling of 809666842 in words is "eight hundred nine million, six hundred sixty-six thousand, eight hundred forty-two".