99861986 has 24 divisors (see below), whose sum is σ = 180685440. Its totient is φ = 40543416.

The previous prime is 99861973. The next prime is 99862013. The reversal of 99861986 is 68916899.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4826 + ... + 14933.

It is an arithmetic number, because the mean of its divisors is an integer number (7528560).

Almost surely, 2^99861986 is an apocalyptic number.

99861986 is a deficient number, since it is larger than the sum of its proper divisors (80823454).

99861986 is a wasteful number, since it uses less digits than its factorization.

99861986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19806 (or 19787 counting only the distinct ones).

The product of its digits is 1679616, while the sum is 56.

The square root of 99861986 is about 9993.0969173725. The cubic root of 99861986 is about 463.9452503028.

The spelling of 99861986 in words is "ninety-nine million, eight hundred sixty-one thousand, nine hundred eighty-six".