199818198 has 32 divisors (see below), whose sum is σ = 448449120. Its totient is φ = 65944800.

The previous prime is 199818163. The next prime is 199818217. The reversal of 199818198 is 891818991.

199818198 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12865 + ... + 23772.

It is an arithmetic number, because the mean of its divisors is an integer number (14014035).

Almost surely, 2^199818198 is an apocalyptic number.

199818198 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

199818198 is an abundant number, since it is smaller than the sum of its proper divisors (248630922).

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

199818198 is a wasteful number, since it uses less digits than its factorization.

199818198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36749 (or 36743 counting only the distinct ones).

The product of its digits is 373248, while the sum is 54.

The square root of 199818198 is about 14135.7064910106. The cubic root of 199818198 is about 584.6262964998.

The spelling of 199818198 in words is "one hundred ninety-nine million, eight hundred eighteen thousand, one hundred ninety-eight".