198213 has 4 divisors (see below), whose sum is σ = 264288. Its totient is φ = 132140.

The previous prime is 198197. The next prime is 198221. The reversal of 198213 is 312891.

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, and also an emirpimes, since its reverse is a distinct semiprime: 312891 = 3 ⋅104297.

It is a cyclic number.

It is not a de Polignac number, because 198213 - 2⁴ = 198197 is a prime.

It is a D-number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33033 + ... + 33038.

It is an arithmetic number, because the mean of its divisors is an integer number (66072).

2¹⁹⁸²¹³ is an apocalyptic number.

It is an amenable number.

198213 is a deficient number, since it is larger than the sum of its proper divisors (66075).

198213 is an equidigital number, since it uses as much as digits as its factorization.

198213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66074.

The product of its digits is 432, while the sum is 24.

The square root of 198213 is about 445.2111858433. The cubic root of 198213 is about 58.3056594357.

The spelling of 198213 in words is "one hundred ninety-eight thousand, two hundred thirteen".