99859985 has 16 divisors (see below), whose sum is σ = 122421456. Its totient is φ = 78179328.

The previous prime is 99859979. The next prime is 99859999. The reversal of 99859985 is 58995899.

It can be written as a sum of positive squares in 8 ways, for example, as 9096256 + 90763729 = 3016^2 + 9527^2 .

It is a cyclic number.

It is not a de Polignac number, because 99859985 - 2⁸ = 99859729 is a prime.

It is a Duffinian 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, 49007 + ... + 51003.

It is an arithmetic number, because the mean of its divisors is an integer number (7651341).

Almost surely, 2^99859985 is an apocalyptic number.

It is an amenable number.

99859985 is a deficient number, since it is larger than the sum of its proper divisors (22561471).

99859985 is a wasteful number, since it uses less digits than its factorization.

99859985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2212.

The product of its digits is 10497600, while the sum is 62.

The square root of 99859985 is about 9992.9967977579. The cubic root of 99859985 is about 463.9421514906.

The spelling of 99859985 in words is "ninety-nine million, eight hundred fifty-nine thousand, nine hundred eighty-five".