2509709 has 4 divisors (see below), whose sum is σ = 2557116. Its totient is φ = 2462304.

The previous prime is 2509687. The next prime is 2509721. The reversal of 2509709 is 9079052.

2509709 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 896809 + 1612900 = 947^2 + 1270^2 .

It is a cyclic number.

It is not a de Polignac number, because 2509709 - 2¹⁶ = 2444173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2500709) 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 3 ways as a sum of consecutive naturals, for example, 23624 + ... + 23729.

It is an arithmetic number, because the mean of its divisors is an integer number (639279).

2^2509709 is an apocalyptic number.

It is an amenable number.

2509709 is a deficient number, since it is larger than the sum of its proper divisors (47407).

2509709 is an equidigital number, since it uses as much as digits as its factorization.

2509709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47406.

The product of its (nonzero) digits is 5670, while the sum is 32.

The square root of 2509709 is about 1584.2061103278. The cubic root of 2509709 is about 135.8963490802.

The spelling of 2509709 in words is "two million, five hundred nine thousand, seven hundred nine".