198812 has 12 divisors (see below), whose sum is σ = 363216. Its totient is φ = 95040.

The previous prime is 198811. The next prime is 198817. The reversal of 198812 is 218891.

It is a super-2 number, since 2×198812² = 79052422688, which contains 22 as substring.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 198812.

It is not an unprimeable number, because it can be changed into a prime (198811) 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 in 3 ways as a sum of consecutive naturals, for example, 989 + ... + 1172.

It is an arithmetic number, because the mean of its divisors is an integer number (30268).

2¹⁹⁸⁸¹² is an apocalyptic number.

It is an amenable number.

198812 is a deficient number, since it is larger than the sum of its proper divisors (164404).

198812 is a wasteful number, since it uses less digits than its factorization.

198812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2188 (or 2186 counting only the distinct ones).

The product of its digits is 1152, while the sum is 29.

The square root of 198812 is about 445.8833928282. The cubic root of 198812 is about 58.3643336359.

The spelling of 198812 in words is "one hundred ninety-eight thousand, eight hundred twelve".