2003644 has 6 divisors (see below), whose sum is σ = 3506384. Its totient is φ = 1001820.

The previous prime is 2003641. The next prime is 2003647. The reversal of 2003644 is 4463002.

It is an interprime number because it is at equal distance from previous prime (2003641) and next prime (2003647).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2003641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 250452 + ... + 250459.

2^2003644 is an apocalyptic number.

It is an amenable number.

2003644 is a deficient number, since it is larger than the sum of its proper divisors (1502740).

2003644 is a wasteful number, since it uses less digits than its factorization.

2003644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500915 (or 500913 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 2003644 is about 1415.5013246197. The cubic root of 2003644 is about 126.0685777689.

Adding to 2003644 its reverse (4463002), we get a palindrome (6466646).

It can be divided in two parts, 200 and 3644, that added together give a square (3844 = 62²).

The spelling of 2003644 in words is "two million, three thousand, six hundred forty-four".