198865189 has 8 divisors (see below), whose sum is σ = 200521728. Its totient is φ = 197215440.

The previous prime is 198865187. The next prime is 198865193. The reversal of 198865189 is 981568891.

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 198865189 - 2¹ = 198865187 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198865181) 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, 68679 + ... + 71515.

It is an arithmetic number, because the mean of its divisors is an integer number (25065216).

Almost surely, 2^198865189 is an apocalyptic number.

It is an amenable number.

198865189 is a deficient number, since it is larger than the sum of its proper divisors (1656539).

198865189 is a wasteful number, since it uses less digits than its factorization.

198865189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3395.

The product of its digits is 1244160, while the sum is 55.

The square root of 198865189 is about 14101.9569209383. The cubic root of 198865189 is about 583.6953798929.

The spelling of 198865189 in words is "one hundred ninety-eight million, eight hundred sixty-five thousand, one hundred eighty-nine".