198903 has 4 divisors (see below), whose sum is σ = 265208. Its totient is φ = 132600.

The previous prime is 198901. The next prime is 198929. The reversal of 198903 is 309891.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 198903 - 2¹ = 198901 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 (198901) 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, 33148 + ... + 33153.

It is an arithmetic number, because the mean of its divisors is an integer number (66302).

2¹⁹⁸⁹⁰³ is an apocalyptic number.

198903 is a deficient number, since it is larger than the sum of its proper divisors (66305).

198903 is an equidigital number, since it uses as much as digits as its factorization.

198903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66304.

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 198903 is about 445.9854257708. The cubic root of 198903 is about 58.3732370961.

The spelling of 198903 in words is "one hundred ninety-eight thousand, nine hundred three".