3995647 has 2 divisors, whose sum is σ = 3995648. Its totient is φ = 3995646.

The previous prime is 3995639. The next prime is 3995653. The reversal of 3995647 is 7465993.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3995647 - 2³ = 3995639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3995627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1997823 + 1997824.

It is an arithmetic number, because the mean of its divisors is an integer number (1997824).

Almost surely, 2^3995647 is an apocalyptic number.

3995647 is a deficient number, since it is larger than the sum of its proper divisors (1).

3995647 is an equidigital number, since it uses as much as digits as its factorization.

3995647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 204120, while the sum is 43.

The square root of 3995647 is about 1998.9114537668. The cubic root of 3995647 is about 158.6825013228.

The spelling of 3995647 in words is "three million, nine hundred ninety-five thousand, six hundred forty-seven".