805309885 has 4 divisors (see below), whose sum is σ = 966371868. Its totient is φ = 644247904.

The previous prime is 805309867. The next prime is 805309919. The reversal of 805309885 is 588903508.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 353364804 + 451945081 = 18798^2 + 21259^2 .

It is a cyclic number.

It is not a de Polignac number, because 805309885 - 2²¹ = 803212733 is a prime.

It is a Duffinian number.

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, 80530984 + ... + 80530993.

It is an arithmetic number, because the mean of its divisors is an integer number (241592967).

Almost surely, 2^805309885 is an apocalyptic number.

It is an amenable number.

805309885 is a deficient number, since it is larger than the sum of its proper divisors (161061983).

805309885 is a wasteful number, since it uses less digits than its factorization.

805309885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161061982.

The product of its (nonzero) digits is 345600, while the sum is 46.

The square root of 805309885 is about 28377.9823983313. The cubic root of 805309885 is about 930.3670979179.

The spelling of 805309885 in words is "eight hundred five million, three hundred nine thousand, eight hundred eighty-five".