198984909 has 8 divisors (see below), whose sum is σ = 265385632. Its totient is φ = 132620400.

The previous prime is 198984901. The next prime is 198984911. The reversal of 198984909 is 909489891.

It is a happy number.

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

It is not a de Polignac number, because 198984909 - 2³ = 198984901 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 (198984901) 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, 8802 + ... + 21804.

It is an arithmetic number, because the mean of its divisors is an integer number (33173204).

Almost surely, 2^198984909 is an apocalyptic number.

It is an amenable number.

198984909 is a deficient number, since it is larger than the sum of its proper divisors (66400723).

198984909 is a wasteful number, since it uses less digits than its factorization.

198984909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18107.

The product of its (nonzero) digits is 1679616, while the sum is 57.

The square root of 198984909 is about 14106.2010832116. The cubic root of 198984909 is about 583.8124876900.

The spelling of 198984909 in words is "one hundred ninety-eight million, nine hundred eighty-four thousand, nine hundred nine".