2605665 has 16 divisors (see below), whose sum is σ = 4190976. Its totient is φ = 1382400.

The previous prime is 2605663. The next prime is 2605741. The reversal of 2605665 is 5665062.

It is not a de Polignac number, because 2605665 - 2¹ = 2605663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2605661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3745 + ... + 4385.

It is an arithmetic number, because the mean of its divisors is an integer number (261936).

2^2605665 is an apocalyptic number.

It is an amenable number.

2605665 is a deficient number, since it is larger than the sum of its proper divisors (1585311).

2605665 is a wasteful number, since it uses less digits than its factorization.

2605665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 920.

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 2605665 is about 1614.2072357662. The cubic root of 2605665 is about 137.6066830459.

The spelling of 2605665 in words is "two million, six hundred five thousand, six hundred sixty-five".