808999705 has 4 divisors (see below), whose sum is σ = 970799652. Its totient is φ = 647199760.

The previous prime is 808999703. The next prime is 808999739. The reversal of 808999705 is 507999808.

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 449100864 + 359898841 = 21192^2 + 18971^2 .

It is not a de Polignac number, because 808999705 - 2¹ = 808999703 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (808999703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80899966 + ... + 80899975.

It is an arithmetic number, because the mean of its divisors is an integer number (242699913).

Almost surely, 2^808999705 is an apocalyptic number.

It is an amenable number.

808999705 is a deficient number, since it is larger than the sum of its proper divisors (161799947).

808999705 is a wasteful number, since it uses less digits than its factorization.

808999705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161799946.

The product of its (nonzero) digits is 1632960, while the sum is 55.

The square root of 808999705 is about 28442.9201208315. The cubic root of 808999705 is about 931.7858716048.

The spelling of 808999705 in words is "eight hundred eight million, nine hundred ninety-nine thousand, seven hundred five".