198890388 has 36 divisors (see below), whose sum is σ = 503586720. Its totient is φ = 66186576.

The previous prime is 198890353. The next prime is 198890399. The reversal of 198890388 is 883098891.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19023 + ... + 27561.

It is an arithmetic number, because the mean of its divisors is an integer number (13988520).

Almost surely, 2^198890388 is an apocalyptic number.

198890388 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

198890388 is an abundant number, since it is smaller than the sum of its proper divisors (304696332).

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

198890388 is a wasteful number, since it uses less digits than its factorization.

198890388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9196 (or 9191 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 54.

The square root of 198890388 is about 14102.8503501952. The cubic root of 198890388 is about 583.7200329736.

The spelling of 198890388 in words is "one hundred ninety-eight million, eight hundred ninety thousand, three hundred eighty-eight".