198911812 has 24 divisors (see below), whose sum is σ = 392837760. Its totient is φ = 87296160.

The previous prime is 198911777. The next prime is 198911831. The reversal of 198911812 is 218119891.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76668 + ... + 79219.

It is an arithmetic number, because the mean of its divisors is an integer number (16368240).

Almost surely, 2^198911812 is an apocalyptic number.

It is an amenable number.

198911812 is a deficient number, since it is larger than the sum of its proper divisors (193925948).

198911812 is a wasteful number, since it uses less digits than its factorization.

198911812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155931 (or 155929 counting only the distinct ones).

The product of its digits is 10368, while the sum is 40.

The square root of 198911812 is about 14103.6098925062. The cubic root of 198911812 is about 583.7409911994.

The spelling of 198911812 in words is "one hundred ninety-eight million, nine hundred eleven thousand, eight hundred twelve".