198188947 has 8 divisors (see below), whose sum is σ = 216308160. Its totient is φ = 180086760.

The previous prime is 198188927. The next prime is 198188993. The reversal of 198188947 is 749881891.

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

It is a cyclic number.

It is not a de Polignac number, because 198188947 - 2⁷ = 198188819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198188927) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41968 + ... + 46450.

It is an arithmetic number, because the mean of its divisors is an integer number (27038520).

Almost surely, 2^198188947 is an apocalyptic number.

198188947 is a deficient number, since it is larger than the sum of its proper divisors (18119213).

198188947 is a wasteful number, since it uses less digits than its factorization.

198188947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8513.

The product of its digits is 1161216, while the sum is 55.

The square root of 198188947 is about 14077.9596177855. The cubic root of 198188947 is about 583.0330089081.

The spelling of 198188947 in words is "one hundred ninety-eight million, one hundred eighty-eight thousand, nine hundred forty-seven".