199986 has 8 divisors (see below), whose sum is σ = 399984. Its totient is φ = 66660.

The previous prime is 199967. The next prime is 199999. The reversal of 199986 is 689991.

199986 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

199986 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16660 + ... + 16671.

It is an arithmetic number, because the mean of its divisors is an integer number (49998).

2¹⁹⁹⁹⁸⁶ is an apocalyptic number.

199986 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

199986 is a wasteful number, since it uses less digits than its factorization.

199986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33336.

The product of its digits is 34992, while the sum is 42.

The square root of 199986 is about 447.1979427502. The cubic root of 199986 is about 58.4789901908.

Adding to 199986 its sum of digits (42), we get a triangular number (200028 = T₆₃₂).

The spelling of 199986 in words is "one hundred ninety-nine thousand, nine hundred eighty-six".