2009709 has 24 divisors (see below), whose sum is σ = 3177720. Its totient is φ = 1216512.

The previous prime is 2009669. The next prime is 2009713. The reversal of 2009709 is 9079002.

It can be written as a sum of positive squares in 4 ways, for example, as 21609 + 1988100 = 147^2 + 1410^2 .

It is not a de Polignac number, because 2009709 - 2¹¹ = 2007661 is a prime.

It is an Ulam number.

It is a Curzon number.

2009709 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2009719) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 10317 + ... + 10509.

It is an arithmetic number, because the mean of its divisors is an integer number (132405).

2^2009709 is an apocalyptic number.

It is an amenable number.

2009709 is a deficient number, since it is larger than the sum of its proper divisors (1168011).

2009709 is a wasteful number, since it uses less digits than its factorization.

2009709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301 (or 298 counting only the distinct ones).

The product of its (nonzero) digits is 1134, while the sum is 27.

The square root of 2009709 is about 1417.6420563739. The cubic root of 2009709 is about 126.1956521952.

The spelling of 2009709 in words is "two million, nine thousand, seven hundred nine".