99986 has 4 divisors (see below), whose sum is σ = 149982. Its totient is φ = 49992.

The previous prime is 99971. The next prime is 99989. The reversal of 99986 is 68999.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 68999 = 7 ⋅9857.

It can be written as a sum of positive squares in only one way, i.e., 78961 + 21025 = 281^2 + 145^2 .

It is a nialpdrome in base 10.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 99986.

It is not an unprimeable number, because it can be changed into a prime (99989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24995 + ... + 24998.

2⁹⁹⁹⁸⁶ is an apocalyptic number.

99986 is a deficient number, since it is larger than the sum of its proper divisors (49996).

99986 is a wasteful number, since it uses less digits than its factorization.

99986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49995.

The product of its digits is 34992, while the sum is 41.

The square root of 99986 is about 316.2056292984. The cubic root of 99986 is about 46.4137221602.

The spelling of 99986 in words is "ninety-nine thousand, nine hundred eighty-six".