198984321 has 12 divisors (see below), whose sum is σ = 302549520. Its totient is φ = 125674200.

The previous prime is 198984311. The next prime is 198984353. The reversal of 198984321 is 123489891.

It is not a de Polignac number, because 198984321 - 2¹⁸ = 198722177 is a prime.

It is not an unprimeable number, because it can be changed into a prime (198984311) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 581655 + ... + 581996.

It is an arithmetic number, because the mean of its divisors is an integer number (25212460).

Almost surely, 2^198984321 is an apocalyptic number.

It is an amenable number.

198984321 is a deficient number, since it is larger than the sum of its proper divisors (103565199).

198984321 is a wasteful number, since it uses less digits than its factorization.

198984321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1163676 (or 1163673 counting only the distinct ones).

The product of its digits is 124416, while the sum is 45.

The square root of 198984321 is about 14106.1802412985. The cubic root of 198984321 is about 583.8119126345.

The spelling of 198984321 in words is "one hundred ninety-eight million, nine hundred eighty-four thousand, three hundred twenty-one".