199812 has 12 divisors (see below), whose sum is σ = 466256. Its totient is φ = 66600.

The previous prime is 199811. The next prime is 199813. The reversal of 199812 is 218991.

It is an interprime number because it is at equal distance from previous prime (199811) and next prime (199813).

It is a tau number, because it is divible by the number of its divisors (12).

It is a nialpdrome in base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 199812.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 199812.

It is not an unprimeable number, because it can be changed into a prime (199811) 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, 8314 + ... + 8337.

2¹⁹⁹⁸¹² is an apocalyptic number.

199812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

199812 is an abundant number, since it is smaller than the sum of its proper divisors (266444).

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

199812 is a wasteful number, since it uses less digits than its factorization.

199812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16658 (or 16656 counting only the distinct ones).

The product of its digits is 1296, while the sum is 30.

The square root of 199812 is about 447.0033556921. The cubic root of 199812 is about 58.4620251753.

The spelling of 199812 in words is "one hundred ninety-nine thousand, eight hundred twelve".