198643418 has 8 divisors (see below), whose sum is σ = 299377920. Its totient is φ = 98850780.

The previous prime is 198643411. The next prime is 198643421. The reversal of 198643418 is 814346891.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (198643411) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 234938 + ... + 235781.

It is an arithmetic number, because the mean of its divisors is an integer number (37422240).

Almost surely, 2^198643418 is an apocalyptic number.

198643418 is a deficient number, since it is larger than the sum of its proper divisors (100734502).

198643418 is a wasteful number, since it uses less digits than its factorization.

198643418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 470932.

The product of its digits is 165888, while the sum is 44.

The square root of 198643418 is about 14094.0915989644. The cubic root of 198643418 is about 583.4783235418.

The spelling of 198643418 in words is "one hundred ninety-eight million, six hundred forty-three thousand, four hundred eighteen".