99999986 has 8 divisors (see below), whose sum is σ = 154838784.
Its totient is φ = 48387060.
The previous prime is 99999971. The next prime is 99999989. The reversal of 99999986 is 68999999.
It is a sphenic number, since it is the product of 3 distinct primes.
It is a nialpdrome in base 10.
It is not an unprimeable number, because it can be changed into a prime (99999989) by changing a digit.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 806390 + ... + 806513.
It is an arithmetic number, because the mean of its divisors is an integer number (19354848).
Almost surely, 299999986 is an apocalyptic number.
99999986 is a deficient number, since it is larger than the sum of its proper divisors (54838798).
99999986 is a wasteful number, since it uses less digits than its factorization.
99999986 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 1612936.
The product of its digits is 25509168, while the sum is 68.
The square root of 99999986 is about 9999.9993000000.
Note that the first 3 decimals coincide.
The cubic root of 99999986 is about 464.1588617005.
The spelling of 99999986 in words is "ninety-nine million, nine hundred ninety-nine thousand, nine hundred eighty-six".