198118636 has 12 divisors (see below), whose sum is σ = 349355160. Its totient is φ = 98302880.

The previous prime is 198118631. The next prime is 198118699. The reversal of 198118636 is 636811891.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 198118592 and 198118601.

It is not an unprimeable number, because it can be changed into a prime (198118631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 188521 + ... + 189568.

It is an arithmetic number, because the mean of its divisors is an integer number (29112930).

Almost surely, 2^198118636 is an apocalyptic number.

It is an amenable number.

198118636 is a deficient number, since it is larger than the sum of its proper divisors (151236524).

198118636 is a wasteful number, since it uses less digits than its factorization.

198118636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378224 (or 378222 counting only the distinct ones).

The product of its digits is 62208, while the sum is 43.

The square root of 198118636 is about 14075.4621948979. The cubic root of 198118636 is about 582.9640536961.

The spelling of 198118636 in words is "one hundred ninety-eight million, one hundred eighteen thousand, six hundred thirty-six".