2003603 has 16 divisors (see below), whose sum is σ = 2462400. Its totient is φ = 1591296.

The previous prime is 2003597. The next prime is 2003611. The reversal of 2003603 is 3063002.

2003603 = 532² + 533² + ... + 538².

It is not a de Polignac number, because 2003603 - 2¹⁰ = 2002579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2003633) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 13373 + ... + 13521.

It is an arithmetic number, because the mean of its divisors is an integer number (153900).

2^2003603 is an apocalyptic number.

2003603 is a deficient number, since it is larger than the sum of its proper divisors (458797).

2003603 is a wasteful number, since it uses less digits than its factorization.

2003603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286.

The product of its (nonzero) digits is 108, while the sum is 14.

The square root of 2003603 is about 1415.4868420441. The cubic root of 2003603 is about 126.0677178612.

Adding to 2003603 its reverse (3063002), we get a palindrome (5066605).

It can be divided in two parts, 200 and 3603, that multiplied together give a triangular number (720600 = T₁₂₀₀).

The spelling of 2003603 in words is "two million, three thousand, six hundred three".