198403 has 4 divisors (see below), whose sum is σ = 199600. Its totient is φ = 197208.

The previous prime is 198397. The next prime is 198409. The reversal of 198403 is 304891.

198403 is nontrivially palindromic in base 16.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 304891 = 509 ⋅599.

It is an interprime number because it is at equal distance from previous prime (198397) and next prime (198409).

It is a cyclic number.

It is not a de Polignac number, because 198403 - 2⁹ = 197891 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (198409) 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, 300 + ... + 697.

It is an arithmetic number, because the mean of its divisors is an integer number (49900).

2¹⁹⁸⁴⁰³ is an apocalyptic number.

198403 is a deficient number, since it is larger than the sum of its proper divisors (1197).

198403 is an equidigital number, since it uses as much as digits as its factorization.

198403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1196.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 198403 is about 445.4245166131. The cubic root of 198403 is about 58.3242834033.

The spelling of 198403 in words is "one hundred ninety-eight thousand, four hundred three".