2160665 has 12 divisors (see below), whose sum is σ = 2808684. Its totient is φ = 1594944.

The previous prime is 2160629. The next prime is 2160671. The reversal of 2160665 is 5660612.

It can be written as a sum of positive squares in 6 ways, for example, as 491401 + 1669264 = 701^2 + 1292^2 .

It is not a de Polignac number, because 2160665 - 2⁸ = 2160409 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 434 + ... + 2123.

It is an arithmetic number, because the mean of its divisors is an integer number (234057).

2^2160665 is an apocalyptic number.

It is an amenable number.

2160665 is a deficient number, since it is larger than the sum of its proper divisors (648019).

2160665 is a wasteful number, since it uses less digits than its factorization.

2160665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2588 (or 2575 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 2160665 is about 1469.9200658539. The cubic root of 2160665 is about 129.2793457729.

The spelling of 2160665 in words is "two million, one hundred sixty thousand, six hundred sixty-five".