203998 has 4 divisors (see below), whose sum is σ = 306000. Its totient is φ = 101998.

The previous prime is 203989. The next prime is 203999. The reversal of 203998 is 899302.

It is a happy number.

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

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203999) by changing a digit.

203998 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50998 + ... + 51001.

It is an arithmetic number, because the mean of its divisors is an integer number (76500).

2²⁰³⁹⁹⁸ is an apocalyptic number.

203998 is a deficient number, since it is larger than the sum of its proper divisors (102002).

203998 is a wasteful number, since it uses less digits than its factorization.

203998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102001.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 203998 is about 451.6613775828. The cubic root of 203998 is about 58.8674607903.

The spelling of 203998 in words is "two hundred three thousand, nine hundred ninety-eight".