2009564 has 12 divisors (see below), whose sum is σ = 3534888. Its totient is φ = 999600.

The previous prime is 2009543. The next prime is 2009593. The reversal of 2009564 is 4659002.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 347 + ... + 2034.

It is an arithmetic number, because the mean of its divisors is an integer number (294574).

2^2009564 is an apocalyptic number.

It is an amenable number.

2009564 is a deficient number, since it is larger than the sum of its proper divisors (1525324).

2009564 is a wasteful number, since it uses less digits than its factorization.

2009564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2596 (or 2594 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 2009564 is about 1417.5909141921. The cubic root of 2009564 is about 126.1926171273.

The spelling of 2009564 in words is "two million, nine thousand, five hundred sixty-four".