198868999 has 32 divisors (see below), whose sum is σ = 244224000. Its totient is φ = 161652960.

The previous prime is 198868997. The next prime is 198869051. The reversal of 198868999 is 999868891.

It is not a de Polignac number, because 198868999 - 2¹ = 198868997 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 (198868997) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 627189 + ... + 627505.

It is an arithmetic number, because the mean of its divisors is an integer number (7632000).

Almost surely, 2^198868999 is an apocalyptic number.

198868999 is a deficient number, since it is larger than the sum of its proper divisors (45355001).

198868999 is an equidigital number, since it uses as much as digits as its factorization.

198868999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428 (or 414 counting only the distinct ones).

The product of its digits is 20155392, while the sum is 67.

The square root of 198868999 is about 14102.0920079256. The cubic root of 198868999 is about 583.6991074854.

The spelling of 198868999 in words is "one hundred ninety-eight million, eight hundred sixty-eight thousand, nine hundred ninety-nine".