198813 has 4 divisors (see below), whose sum is σ = 265088. Its totient is φ = 132540.

The previous prime is 198811. The next prime is 198817. The reversal of 198813 is 318891.

198813 is nontrivially palindromic in base 12.

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: 318891 = 3 ⋅106297.

It is not a de Polignac number, because 198813 - 2¹ = 198811 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198811) 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, 33133 + ... + 33138.

It is an arithmetic number, because the mean of its divisors is an integer number (66272).

2¹⁹⁸⁸¹³ is an apocalyptic number.

It is an amenable number.

198813 is a deficient number, since it is larger than the sum of its proper divisors (66275).

198813 is an equidigital number, since it uses as much as digits as its factorization.

198813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66274.

The product of its digits is 1728, while the sum is 30.

The square root of 198813 is about 445.8845141962. The cubic root of 198813 is about 58.3644314908.

The spelling of 198813 in words is "one hundred ninety-eight thousand, eight hundred thirteen".