198840321 has 6 divisors (see below), whose sum is σ = 287213810. Its totient is φ = 132560208.

The previous prime is 198840319. The next prime is 198840349. The reversal of 198840321 is 123048891.

It can be written as a sum of positive squares in only one way, i.e., 197121600 + 1718721 = 14040^2 + 1311^2 .

It is not a de Polignac number, because 198840321 - 2¹ = 198840319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198840371) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11046676 + ... + 11046693.

Almost surely, 2^198840321 is an apocalyptic number.

It is an amenable number.

198840321 is a deficient number, since it is larger than the sum of its proper divisors (88373489).

198840321 is a wasteful number, since it uses less digits than its factorization.

198840321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22093375 (or 22093372 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 198840321 is about 14101.0751717733. The cubic root of 198840321 is about 583.6710485994.

The spelling of 198840321 in words is "one hundred ninety-eight million, eight hundred forty thousand, three hundred twenty-one".