198985812 has 12 divisors (see below), whose sum is σ = 464300256. Its totient is φ = 66328600.

The previous prime is 198985793. The next prime is 198985817. The reversal of 198985812 is 218589891.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198985817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8291064 + ... + 8291087.

It is an arithmetic number, because the mean of its divisors is an integer number (38691688).

Almost surely, 2^198985812 is an apocalyptic number.

198985812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

198985812 is an abundant number, since it is smaller than the sum of its proper divisors (265314444).

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

198985812 is a wasteful number, since it uses less digits than its factorization.

198985812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16582158 (or 16582156 counting only the distinct ones).

The product of its digits is 414720, while the sum is 51.

The square root of 198985812 is about 14106.2330903753. The cubic root of 198985812 is about 583.8133708086.

The spelling of 198985812 in words is "one hundred ninety-eight million, nine hundred eighty-five thousand, eight hundred twelve".