2009538 has 12 divisors (see below), whose sum is σ = 4354038. Its totient is φ = 669840.

The previous prime is 2009537. The next prime is 2009543. The reversal of 2009538 is 8359002.

It can be written as a sum of positive squares in only one way, i.e., 1830609 + 178929 = 1353^2 + 423^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2009537) 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 5 ways as a sum of consecutive naturals, for example, 55803 + ... + 55838.

2^2009538 is an apocalyptic number.

2009538 is an abundant number, since it is smaller than the sum of its proper divisors (2344500).

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

2009538 is a wasteful number, since it uses less digits than its factorization.

2009538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111649 (or 111646 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 2009538 is about 1417.5817436748. The cubic root of 2009538 is about 126.1920728928.

The spelling of 2009538 in words is "two million, nine thousand, five hundred thirty-eight".