3865216 has 16 divisors (see below), whose sum is σ = 7700490. Its totient is φ = 1932544.

The previous prime is 3865187. The next prime is 3865229. The reversal of 3865216 is 6125683.

3865216 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 3594816 + 270400 = 1896^2 + 520^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14971 + ... + 15226.

Almost surely, 2^3865216 is an apocalyptic number.

It is an amenable number.

3865216 is a deficient number, since it is larger than the sum of its proper divisors (3835274).

3865216 is an equidigital number, since it uses as much as digits as its factorization.

3865216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30211 (or 30199 counting only the distinct ones).

The product of its digits is 8640, while the sum is 31.

The square root of 3865216 is about 1966.0152593508. The cubic root of 3865216 is about 156.9367265013.

The spelling of 3865216 in words is "three million, eight hundred sixty-five thousand, two hundred sixteen".