2605709 has 4 divisors (see below), whose sum is σ = 2759004. Its totient is φ = 2452416.

The previous prime is 2605663. The next prime is 2605741. The reversal of 2605709 is 9075062.

2605709 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, and also an emirpimes, since its reverse is a distinct semiprime: 9075062 = 2 ⋅4537531.

It can be written as a sum of positive squares in 2 ways, for example, as 1755625 + 850084 = 1325^2 + 922^2 .

It is a cyclic number.

It is not a de Polignac number, because 2605709 - 2¹⁶ = 2540173 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 (2605769) 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, 76622 + ... + 76655.

It is an arithmetic number, because the mean of its divisors is an integer number (689751).

2^2605709 is an apocalyptic number.

It is an amenable number.

2605709 is a deficient number, since it is larger than the sum of its proper divisors (153295).

2605709 is a wasteful number, since it uses less digits than its factorization.

2605709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153294.

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 2605709 is about 1614.2208646898. The cubic root of 2605709 is about 137.6074575968.

The spelling of 2605709 in words is "two million, six hundred five thousand, seven hundred nine".