3856665 has 16 divisors (see below), whose sum is σ = 6322176. Its totient is φ = 2006400.

The previous prime is 3856661. The next prime is 3856667. The reversal of 3856665 is 5666583.

It is not a de Polignac number, because 3856665 - 2² = 3856661 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3856661) 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, 2521 + ... + 3750.

It is an arithmetic number, because the mean of its divisors is an integer number (395136).

Almost surely, 2^3856665 is an apocalyptic number.

It is an amenable number.

3856665 is a deficient number, since it is larger than the sum of its proper divisors (2465511).

3856665 is a wasteful number, since it uses less digits than its factorization.

3856665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6320.

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

The square root of 3856665 is about 1963.8393518819. The cubic root of 3856665 is about 156.8209109147.

The spelling of 3856665 in words is "three million, eight hundred fifty-six thousand, six hundred sixty-five".