99859986 has 16 divisors (see below), whose sum is σ = 221911200.
Its totient is φ = 33286644.
The previous prime is 99859979. The next prime is 99859999. The reversal of 99859986 is 68995899.
It is an unprimeable number.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 924576 + ... + 924683.
It is an arithmetic number, because the mean of its divisors is an integer number (13869450).
Almost surely, 299859986 is an apocalyptic number.
99859986 is an abundant number, since it is smaller than the sum of its proper divisors (122051214).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
99859986 is a wasteful number, since it uses less digits than its factorization.
99859986 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 1849270 (or 1849264 counting only the distinct ones).
The product of its digits is 12597120, while the sum is 63.
The square root of 99859986 is about 9992.9968477930.
The cubic root of 99859986 is about 463.9421530392.
Adding to 99859986 its sum of digits (63), we get a square (99860049 = 99932).
The spelling of 99859986 in words is "ninety-nine million, eight hundred fifty-nine thousand, nine hundred eighty-six".