2003909 has 4 divisors (see below), whose sum is σ = 2121804. Its totient is φ = 1886016.

The previous prime is 2003879. The next prime is 2003917. The reversal of 2003909 is 9093002.

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 616225 + 1387684 = 785^2 + 1178^2 .

It is a cyclic number.

It is not a de Polignac number, because 2003909 - 2⁸ = 2003653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2003959) 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, 58922 + ... + 58955.

It is an arithmetic number, because the mean of its divisors is an integer number (530451).

2^2003909 is an apocalyptic number.

It is an amenable number.

2003909 is a deficient number, since it is larger than the sum of its proper divisors (117895).

2003909 is a wasteful number, since it uses less digits than its factorization.

2003909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117894.

The product of its (nonzero) digits is 486, while the sum is 23.

The square root of 2003909 is about 1415.5949279367. The cubic root of 2003909 is about 126.0741354262.

The spelling of 2003909 in words is "two million, three thousand, nine hundred nine".