198393187 has 2 divisors, whose sum is σ = 198393188. Its totient is φ = 198393186.

The previous prime is 198393163. The next prime is 198393191. The reversal of 198393187 is 781393891.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198393187 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 198393187.

It is not a weakly prime, because it can be changed into another prime (198393127) 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 as a sum of consecutive naturals, namely, 99196593 + 99196594.

It is an arithmetic number, because the mean of its divisors is an integer number (99196594).

Almost surely, 2^198393187 is an apocalyptic number.

198393187 is a deficient number, since it is larger than the sum of its proper divisors (1).

198393187 is an equidigital number, since it uses as much as digits as its factorization.

198393187 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 326592, while the sum is 49.

The square root of 198393187 is about 14085.2116420024. The cubic root of 198393187 is about 583.2332181565.

The spelling of 198393187 in words is "one hundred ninety-eight million, three hundred ninety-three thousand, one hundred eighty-seven".