198321889 has 4 divisors (see below), whose sum is σ = 198369280. Its totient is φ = 198274500.

The previous prime is 198321869. The next prime is 198321941. The reversal of 198321889 is 988123891.

198321889 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198321889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198321839) 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, 16737 + ... + 26014.

It is an arithmetic number, because the mean of its divisors is an integer number (49592320).

Almost surely, 2^198321889 is an apocalyptic number.

It is an amenable number.

198321889 is a deficient number, since it is larger than the sum of its proper divisors (47391).

198321889 is an equidigital number, since it uses as much as digits as its factorization.

198321889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47390.

The product of its digits is 248832, while the sum is 49.

The square root of 198321889 is about 14082.6804621847. The cubic root of 198321889 is about 583.1633428666.

The spelling of 198321889 in words is "one hundred ninety-eight million, three hundred twenty-one thousand, eight hundred eighty-nine".