503903 has 4 divisors (see below), whose sum is σ = 517560. Its totient is φ = 490248.

The previous prime is 503879. The next prime is 503911. The reversal of 503903 is 309305.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 309305 = 5 ⋅61861.

It is a cyclic number.

It is not a de Polignac number, because 503903 - 2⁸ = 503647 is a prime.

It is an Ulam 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 (503963) 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, 6773 + ... + 6846.

It is an arithmetic number, because the mean of its divisors is an integer number (129390).

2⁵⁰³⁹⁰³ is an apocalyptic number.

503903 is a deficient number, since it is larger than the sum of its proper divisors (13657).

503903 is a wasteful number, since it uses less digits than its factorization.

503903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13656.

The product of its (nonzero) digits is 405, while the sum is 20.

The square root of 503903 is about 709.8612540490. The cubic root of 503903 is about 79.5760384263.

The spelling of 503903 in words is "five hundred three thousand, nine hundred three".