198889138 has 24 divisors (see below), whose sum is σ = 347551344. Its totient is φ = 85113000.

The previous prime is 198889129. The next prime is 198889199. The reversal of 198889138 is 831988891.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 102033 + ... + 103963.

It is an arithmetic number, because the mean of its divisors is an integer number (14481306).

Almost surely, 2^198889138 is an apocalyptic number.

198889138 is a deficient number, since it is larger than the sum of its proper divisors (148662206).

198889138 is a wasteful number, since it uses less digits than its factorization.

198889138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2998 (or 2991 counting only the distinct ones).

The product of its digits is 995328, while the sum is 55.

The square root of 198889138 is about 14102.8060328433. The cubic root of 198889138 is about 583.7188101031.

The spelling of 198889138 in words is "one hundred ninety-eight million, eight hundred eighty-nine thousand, one hundred thirty-eight".