198372921 has 8 divisors (see below), whose sum is σ = 264604320. Its totient is φ = 132195072.

The previous prime is 198372919. The next prime is 198372931. The reversal of 198372921 is 129273891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 198372921 - 2¹ = 198372919 is a prime.

It is not an unprimeable number, because it can be changed into a prime (198372931) 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 7 ways as a sum of consecutive naturals, for example, 3751 + ... + 20268.

It is an arithmetic number, because the mean of its divisors is an integer number (33075540).

Almost surely, 2^198372921 is an apocalyptic number.

It is an amenable number.

198372921 is a deficient number, since it is larger than the sum of its proper divisors (66231399).

198372921 is a wasteful number, since it uses less digits than its factorization.

198372921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26775.

The product of its digits is 54432, while the sum is 42.

The square root of 198372921 is about 14084.4922166190. The cubic root of 198372921 is about 583.2133582559.

The spelling of 198372921 in words is "one hundred ninety-eight million, three hundred seventy-two thousand, nine hundred twenty-one".