199966 has 8 divisors (see below), whose sum is σ = 323064. Its totient is φ = 92280.

The previous prime is 199961. The next prime is 199967. The reversal of 199966 is 669991.

199966 is digitally balanced in base 2, 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.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199961) 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, 3820 + ... + 3871.

It is an arithmetic number, because the mean of its divisors is an integer number (40383).

2¹⁹⁹⁹⁶⁶ is an apocalyptic number.

199966 is a deficient number, since it is larger than the sum of its proper divisors (123098).

199966 is a wasteful number, since it uses less digits than its factorization.

199966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7706.

The product of its digits is 26244, while the sum is 40.

The square root of 199966 is about 447.1755807286. The cubic root of 199966 is about 58.4770406897.

It can be divided in two parts, 19996 and 6, that added together give a palindrome (20002).

The spelling of 199966 in words is "one hundred ninety-nine thousand, nine hundred sixty-six".