3995865 has 16 divisors (see below), whose sum is σ = 7104000. Its totient is φ = 2131056.

The previous prime is 3995851. The next prime is 3995891. The reversal of 3995865 is 5685993.

It is not a de Polignac number, because 3995865 - 2⁸ = 3995609 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 3995865.

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, 14665 + ... + 14934.

It is an arithmetic number, because the mean of its divisors is an integer number (444000).

Almost surely, 2^3995865 is an apocalyptic number.

It is an amenable number.

3995865 is a deficient number, since it is larger than the sum of its proper divisors (3108135).

3995865 is a wasteful number, since it uses less digits than its factorization.

3995865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29613 (or 29607 counting only the distinct ones).

The product of its digits is 291600, while the sum is 45.

The square root of 3995865 is about 1998.9659827021. The cubic root of 3995865 is about 158.6853871430.

The spelling of 3995865 in words is "three million, nine hundred ninety-five thousand, eight hundred sixty-five".