198353999 has 4 divisors (see below), whose sum is σ = 198382800. Its totient is φ = 198325200.

The previous prime is 198353989. The next prime is 198354031. The reversal of 198353999 is 999353891.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 198353999 - 2⁴ = 198353983 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 (198353989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2699 + ... + 20099.

It is an arithmetic number, because the mean of its divisors is an integer number (49595700).

Almost surely, 2^198353999 is an apocalyptic number.

198353999 is a deficient number, since it is larger than the sum of its proper divisors (28801).

198353999 is a wasteful number, since it uses less digits than its factorization.

198353999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28800.

The product of its digits is 2361960, while the sum is 56.

The square root of 198353999 is about 14083.8204688927. The cubic root of 198353999 is about 583.1948142026.

The spelling of 198353999 in words is "one hundred ninety-eight million, three hundred fifty-three thousand, nine hundred ninety-nine".