809042840 has 16 divisors (see below), whose sum is σ = 1820346480. Its totient is φ = 323617120.

The previous prime is 809042831. The next prime is 809042887. The reversal of 809042840 is 48240908.

It is a self number, because there is not a number n which added to its sum of digits gives 809042840.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 10112996 + ... + 10113075.

It is an arithmetic number, because the mean of its divisors is an integer number (113771655).

Almost surely, 2^809042840 is an apocalyptic number.

It is an amenable number.

809042840 is an abundant number, since it is smaller than the sum of its proper divisors (1011303640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

809042840 is a wasteful number, since it uses less digits than its factorization.

809042840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20226082 (or 20226078 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 35.

The square root of 809042840 is about 28443.6783837815. The cubic root of 809042840 is about 931.8024319195.

The spelling of 809042840 in words is "eight hundred nine million, forty-two thousand, eight hundred forty".