99866 has 16 divisors (see below), whose sum is σ = 169344. Its totient is φ = 43824.

The previous prime is 99859. The next prime is 99871. The reversal of 99866 is 66899.

99866 is a strobogrammatic number because it is the same when read upside-down.

It is a nialpdrome in base 10.

It is an unprimeable number.

99866 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 in 7 ways as a sum of consecutive naturals, for example, 515 + ... + 681.

It is an arithmetic number, because the mean of its divisors is an integer number (10584).

2⁹⁹⁸⁶⁶ is an apocalyptic number.

99866 is a deficient number, since it is larger than the sum of its proper divisors (69478).

99866 is a wasteful number, since it uses less digits than its factorization.

99866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205.

The product of its digits is 23328, while the sum is 38.

The square root of 99866 is about 316.0158223887. The cubic root of 99866 is about 46.3951466386.

The spelling of 99866 in words is "ninety-nine thousand, eight hundred sixty-six".