198189406 has 8 divisors (see below), whose sum is σ = 299454480. Its totient is φ = 98371248.

The previous prime is 198189403. The next prime is 198189443. The reversal of 198189406 is 604981891.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198189401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 361386 + ... + 361933.

It is an arithmetic number, because the mean of its divisors is an integer number (37431810).

Almost surely, 2^198189406 is an apocalyptic number.

198189406 is a deficient number, since it is larger than the sum of its proper divisors (101265074).

198189406 is a wasteful number, since it uses less digits than its factorization.

198189406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 723458.

The product of its (nonzero) digits is 124416, while the sum is 46.

The square root of 198189406 is about 14077.9759198544. The cubic root of 198189406 is about 583.0334590037.

The spelling of 198189406 in words is "one hundred ninety-eight million, one hundred eighty-nine thousand, four hundred six".