3660865 has 16 divisors (see below), whose sum is σ = 5010768. Its totient is φ = 2543616.

The previous prime is 3660847. The next prime is 3660871. The reversal of 3660865 is 5680663.

It can be written as a sum of positive squares in 8 ways, for example, as 66049 + 3594816 = 257^2 + 1896^2 .

It is a 3-Lehmer number, since φ(3660865) divides (3660865-1)³.

It is a cyclic number.

It is not a de Polignac number, because 3660865 - 2⁹ = 3660353 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 3660865.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 552 + ... + 2761.

It is an arithmetic number, because the mean of its divisors is an integer number (313173).

Almost surely, 2^3660865 is an apocalyptic number.

3660865 is the 1105-th octagonal number.

It is an amenable number.

3660865 is a deficient number, since it is larger than the sum of its proper divisors (1349903).

3660865 is a wasteful number, since it uses less digits than its factorization.

3660865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3348.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 3660865 is about 1913.3387049867. The cubic root of 3660865 is about 154.1207940785.

The spelling of 3660865 in words is "three million, six hundred sixty thousand, eight hundred sixty-five".