2003605 has 4 divisors (see below), whose sum is σ = 2404332. Its totient is φ = 1602880.

The previous prime is 2003597. The next prime is 2003611. The reversal of 2003605 is 5063002.

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

It can be written as a sum of positive squares in 2 ways, for example, as 461041 + 1542564 = 679^2 + 1242^2 .

It is not a de Polignac number, because 2003605 - 2³ = 2003597 is a prime.

It is a Duffinian number.

2003605 is a lucky number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 200356 + ... + 200365.

It is an arithmetic number, because the mean of its divisors is an integer number (601083).

2^2003605 is an apocalyptic number.

It is an amenable number.

2003605 is a deficient number, since it is larger than the sum of its proper divisors (400727).

2003605 is an equidigital number, since it uses as much as digits as its factorization.

2003605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400726.

The product of its (nonzero) digits is 180, while the sum is 16.

The square root of 2003605 is about 1415.4875485146. The cubic root of 2003605 is about 126.0677598082.

Adding to 2003605 its reverse (5063002), we get a palindrome (7066607).

The spelling of 2003605 in words is "two million, three thousand, six hundred five".