503999903 has 16 divisors (see below), whose sum is σ = 584163360. Its totient is φ = 430416000.

The previous prime is 503999887. The next prime is 503999911. The reversal of 503999903 is 309999305.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 503999903 - 2⁴ = 503999887 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (503999303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9548 + ... + 33153.

It is an arithmetic number, because the mean of its divisors is an integer number (36510210).

Almost surely, 2^503999903 is an apocalyptic number.

503999903 is a deficient number, since it is larger than the sum of its proper divisors (80163457).

503999903 is a wasteful number, since it uses less digits than its factorization.

503999903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42778.

The product of its (nonzero) digits is 295245, while the sum is 47.

The square root of 503999903 is about 22449.9421602818. The cubic root of 503999903 is about 795.8113905252.

The spelling of 503999903 in words is "five hundred three million, nine hundred ninety-nine thousand, nine hundred three".