198642321 has 32 divisors (see below), whose sum is σ = 315072000. Its totient is φ = 123313104.

The previous prime is 198642319. The next prime is 198642341. The reversal of 198642321 is 123246891.

198642321 is a `hidden beast` number, since 1 + 9 + 8 + 642 + 3 + 2 + 1 = 666.

198642321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 198642321 - 2¹ = 198642319 is a prime.

It is not an unprimeable number, because it can be changed into a prime (198642341) 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, 26986 + ... + 33548.

It is an arithmetic number, because the mean of its divisors is an integer number (9846000).

Almost surely, 2^198642321 is an apocalyptic number.

It is an amenable number.

198642321 is a deficient number, since it is larger than the sum of its proper divisors (116429679).

198642321 is a wasteful number, since it uses less digits than its factorization.

198642321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6650 (or 6644 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 198642321 is about 14094.0526818939. The cubic root of 198642321 is about 583.4772494616.

The spelling of 198642321 in words is "one hundred ninety-eight million, six hundred forty-two thousand, three hundred twenty-one".