198540993 has 24 divisors (see below), whose sum is σ = 310791360. Its totient is φ = 112402080.

The previous prime is 198540971. The next prime is 198541043. The reversal of 198540993 is 399045891.

It is not a de Polignac number, because 198540993 - 2⁶ = 198540929 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (198540493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9828 + ... + 22218.

It is an arithmetic number, because the mean of its divisors is an integer number (12949640).

Almost surely, 2^198540993 is an apocalyptic number.

It is an amenable number.

198540993 is a deficient number, since it is larger than the sum of its proper divisors (112250367).

198540993 is a wasteful number, since it uses less digits than its factorization.

198540993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12517 (or 12510 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 48.

The square root of 198540993 is about 14090.4575156380. The cubic root of 198540993 is about 583.3780214653.

The spelling of 198540993 in words is "one hundred ninety-eight million, five hundred forty thousand, nine hundred ninety-three".