809939885 has 16 divisors (see below), whose sum is σ = 1038360000. Its totient is φ = 604682496.

The previous prime is 809939863. The next prime is 809939899. The reversal of 809939885 is 588939908.

It is a happy number.

809939885 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 809939885 - 2¹⁸ = 809677741 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57260 + ... + 69989.

It is an arithmetic number, because the mean of its divisors is an integer number (64897500).

Almost surely, 2^809939885 is an apocalyptic number.

It is an amenable number.

809939885 is a deficient number, since it is larger than the sum of its proper divisors (228420115).

809939885 is a wasteful number, since it uses less digits than its factorization.

809939885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127340.

The product of its (nonzero) digits is 5598720, while the sum is 59.

The square root of 809939885 is about 28459.4428090221. The cubic root of 809939885 is about 932.1466905635.

The spelling of 809939885 in words is "eight hundred nine million, nine hundred thirty-nine thousand, eight hundred eighty-five".