998503 has 8 divisors (see below), whose sum is σ = 1115136. Its totient is φ = 886200.

The previous prime is 998497. The next prime is 998513. The reversal of 998503 is 305899.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 998503 - 2⁵ = 998471 is a prime.

It is a nialpdrome in base 11.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 583 + ... + 1528.

It is an arithmetic number, because the mean of its divisors is an integer number (139392).

2⁹⁹⁸⁵⁰³ is an apocalyptic number.

998503 is a deficient number, since it is larger than the sum of its proper divisors (116633).

998503 is a wasteful number, since it uses less digits than its factorization.

998503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2165.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 998503 is about 999.2512196640. The cubic root of 998503 is about 99.9500750792.

The spelling of 998503 in words is "nine hundred ninety-eight thousand, five hundred three".