198835609 has 16 divisors (see below), whose sum is σ = 233452800. Its totient is φ = 165795840.

The previous prime is 198835607. The next prime is 198835613. The reversal of 198835609 is 906538891.

It is not a de Polignac number, because 198835609 - 2¹ = 198835607 is a prime.

It is not an unprimeable number, because it can be changed into a prime (198835607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 128092 + ... + 129634.

It is an arithmetic number, because the mean of its divisors is an integer number (14590800).

Almost surely, 2^198835609 is an apocalyptic number.

It is an amenable number.

198835609 is a deficient number, since it is larger than the sum of its proper divisors (34617191).

198835609 is a wasteful number, since it uses less digits than its factorization.

198835609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2040.

The product of its (nonzero) digits is 466560, while the sum is 49.

The square root of 198835609 is about 14100.9080913252. The cubic root of 198835609 is about 583.6664380662. Note that the first 3 decimals are identical.

The spelling of 198835609 in words is "one hundred ninety-eight million, eight hundred thirty-five thousand, six hundred nine".