198905900 has 18 divisors (see below), whose sum is σ = 431626020. Its totient is φ = 79562320.

The previous prime is 198905893. The next prime is 198905923. The reversal of 198905900 is 9509891.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 994430 + ... + 994629.

Almost surely, 2^198905900 is an apocalyptic number.

198905900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

198905900 is an abundant number, since it is smaller than the sum of its proper divisors (232720120).

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

198905900 is a wasteful number, since it uses less digits than its factorization.

198905900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1989073 (or 1989066 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 41.

The square root of 198905900 is about 14103.4002992186. The cubic root of 198905900 is about 583.7352078811.

The spelling of 198905900 in words is "one hundred ninety-eight million, nine hundred five thousand, nine hundred".