3866565 has 32 divisors (see below), whose sum is σ = 6687360. Its totient is φ = 1900544.

The previous prime is 3866543. The next prime is 3866581. The reversal of 3866565 is 5656683.

It is a cyclic number.

It is not a de Polignac number, because 3866565 - 2⁷ = 3866437 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14917 + ... + 15173.

It is an arithmetic number, because the mean of its divisors is an integer number (208980).

Almost surely, 2^3866565 is an apocalyptic number.

It is an amenable number.

3866565 is a deficient number, since it is larger than the sum of its proper divisors (2820795).

3866565 is a wasteful number, since it uses less digits than its factorization.

3866565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341.

The product of its digits is 129600, while the sum is 39.

The square root of 3866565 is about 1966.3583091593. The cubic root of 3866565 is about 156.9549818863.

The spelling of 3866565 in words is "three million, eight hundred sixty-six thousand, five hundred sixty-five".