198111838 has 8 divisors (see below), whose sum is σ = 305199432. Its totient is φ = 96378696.

The previous prime is 198111817. The next prime is 198111869. The reversal of 198111838 is 838111891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 198111838.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1338520 + ... + 1338667.

It is an arithmetic number, because the mean of its divisors is an integer number (38149929).

Almost surely, 2^198111838 is an apocalyptic number.

198111838 is a deficient number, since it is larger than the sum of its proper divisors (107087594).

198111838 is a wasteful number, since it uses less digits than its factorization.

198111838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2677226.

The product of its digits is 13824, while the sum is 40.

The square root of 198111838 is about 14075.2207087491. The cubic root of 198111838 is about 582.9573859152.

The spelling of 198111838 in words is "one hundred ninety-eight million, one hundred eleven thousand, eight hundred thirty-eight".