198207009 has 96 divisors (see below), whose sum is σ = 393120000. Its totient is φ = 94832640.

The previous prime is 198206999. The next prime is 198207011. The reversal of 198207009 is 900702891.

It is a happy number.

It is not a de Polignac number, because 198207009 - 2⁵ = 198206977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (198207089) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 441217 + ... + 441665.

It is an arithmetic number, because the mean of its divisors is an integer number (4095000).

Almost surely, 2^198207009 is an apocalyptic number.

It is an amenable number.

198207009 is a deficient number, since it is larger than the sum of its proper divisors (194912991).

198207009 is a wasteful number, since it uses less digits than its factorization.

198207009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500 (or 483 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 198207009 is about 14078.6011023823. The cubic root of 198207009 is about 583.0507199905.

It can be divided in two parts, 19 and 8207009, that added together give a palindrome (8207028).

The spelling of 198207009 in words is "one hundred ninety-eight million, two hundred seven thousand, nine".