198326789 has 4 divisors (see below), whose sum is σ = 201688320. Its totient is φ = 194965260.

The previous prime is 198326773. The next prime is 198326797. The reversal of 198326789 is 987623891.

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 not a de Polignac number, because 198326789 - 2⁴ = 198326773 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 198326789.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198326749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1680677 + ... + 1680794.

It is an arithmetic number, because the mean of its divisors is an integer number (50422080).

Almost surely, 2^198326789 is an apocalyptic number.

It is an amenable number.

198326789 is a deficient number, since it is larger than the sum of its proper divisors (3361531).

198326789 is an equidigital number, since it uses as much as digits as its factorization.

198326789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3361530.

The product of its digits is 1306368, while the sum is 53.

The square root of 198326789 is about 14082.8544336722. The cubic root of 198326789 is about 583.1681456258.

The spelling of 198326789 in words is "one hundred ninety-eight million, three hundred twenty-six thousand, seven hundred eighty-nine".