809999995 has 16 divisors (see below), whose sum is σ = 1111984128. Its totient is φ = 554865120.

The previous prime is 809999989. The next prime is 809999999. The reversal of 809999995 is 599999908.

It is not a de Polignac number, because 809999995 - 2⁹ = 809999483 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 809999995.

It is not an unprimeable number, because it can be changed into a prime (809999999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24862 + ... + 47308.

It is an arithmetic number, because the mean of its divisors is an integer number (69499008).

Almost surely, 2^809999995 is an apocalyptic number.

809999995 is a deficient number, since it is larger than the sum of its proper divisors (301984133).

809999995 is a wasteful number, since it uses less digits than its factorization.

809999995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23490.

The product of its (nonzero) digits is 21257640, while the sum is 67.

The square root of 809999995 is about 28460.4988536744. The cubic root of 809999995 is about 932.1697498681.

The spelling of 809999995 in words is "eight hundred nine million, nine hundred ninety-nine thousand, nine hundred ninety-five".