3967865 has 16 divisors (see below), whose sum is σ = 5469120. Its totient is φ = 2733120.

The previous prime is 3967841. The next prime is 3967871. The reversal of 3967865 is 5687693.

It is not a de Polignac number, because 3967865 - 2⁶ = 3967801 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 854 + ... + 2943.

It is an arithmetic number, because the mean of its divisors is an integer number (341820).

Almost surely, 2^3967865 is an apocalyptic number.

It is an amenable number.

3967865 is a deficient number, since it is larger than the sum of its proper divisors (1501255).

3967865 is a wasteful number, since it uses less digits than its factorization.

3967865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3832.

The product of its digits is 272160, while the sum is 44.

The square root of 3967865 is about 1991.9500495745. The cubic root of 3967865 is about 158.3138689523.

The spelling of 3967865 in words is "three million, nine hundred sixty-seven thousand, eight hundred sixty-five".