2009644 has 24 divisors (see below), whose sum is σ = 4329248. Its totient is φ = 794880.

The previous prime is 2009639. The next prime is 2009647. The reversal of 2009644 is 4469002.

It is not an unprimeable number, because it can be changed into a prime (2009647) 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 7 ways as a sum of consecutive naturals, for example, 2397 + ... + 3124.

2^2009644 is an apocalyptic number.

It is an amenable number.

2009644 is an abundant number, since it is smaller than the sum of its proper divisors (2319604).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2009644 is a wasteful number, since it uses less digits than its factorization.

2009644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5545 (or 5543 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 2009644 is about 1417.6191307964. The cubic root of 2009644 is about 126.1942916656.

The spelling of 2009644 in words is "two million, nine thousand, six hundred forty-four".