198568138 has 16 divisors (see below), whose sum is σ = 307157760. Its totient is φ = 96223536.

The previous prime is 198568127. The next prime is 198568147. The reversal of 198568138 is 831865891.

It is a junction number, because it is equal to n+sod(n) for n = 198568091 and 198568100.

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, 573 + ... + 19936.

It is an arithmetic number, because the mean of its divisors is an integer number (19197360).

Almost surely, 2^198568138 is an apocalyptic number.

198568138 is a deficient number, since it is larger than the sum of its proper divisors (108589622).

198568138 is a wasteful number, since it uses less digits than its factorization.

198568138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20661.

The product of its digits is 414720, while the sum is 49.

The square root of 198568138 is about 14091.4207232628. The cubic root of 198568138 is about 583.4046072004.

The spelling of 198568138 in words is "one hundred ninety-eight million, five hundred sixty-eight thousand, one hundred thirty-eight".