2503903 has 4 divisors (see below), whose sum is σ = 2509840. Its totient is φ = 2497968.

The previous prime is 2503883. The next prime is 2503909. The reversal of 2503903 is 3093052.

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

It is a cyclic number.

It is not a de Polignac number, because 2503903 - 2⁵ = 2503871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2503909) 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 3 ways as a sum of consecutive naturals, for example, 2283 + ... + 3196.

It is an arithmetic number, because the mean of its divisors is an integer number (627460).

2^2503903 is an apocalyptic number.

2503903 is a deficient number, since it is larger than the sum of its proper divisors (5937).

2503903 is an equidigital number, since it uses as much as digits as its factorization.

2503903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5936.

The product of its (nonzero) digits is 810, while the sum is 22.

The square root of 2503903 is about 1582.3725857079. The cubic root of 2503903 is about 135.7914732526.

Adding to 2503903 its reverse (3093052), we get a palindrome (5596955).

The spelling of 2503903 in words is "two million, five hundred three thousand, nine hundred three".