2609665 has 8 divisors (see below), whose sum is σ = 3140928. Its totient is φ = 2081520.

The previous prime is 2609657. The next prime is 2609671. The reversal of 2609665 is 5669062.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2609665 - 2³ = 2609657 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2609665.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1924 + ... + 2986.

It is an arithmetic number, because the mean of its divisors is an integer number (392616).

2^2609665 is an apocalyptic number.

It is an amenable number.

2609665 is a deficient number, since it is larger than the sum of its proper divisors (531263).

2609665 is a wasteful number, since it uses less digits than its factorization.

2609665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1559.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 2609665 is about 1615.4457589161. The cubic root of 2609665 is about 137.6770611536.

The spelling of 2609665 in words is "two million, six hundred nine thousand, six hundred sixty-five".