3947971 has 2 divisors, whose sum is σ = 3947972. Its totient is φ = 3947970.

The previous prime is 3947963. The next prime is 3947987. The reversal of 3947971 is 1797493.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3947971 - 2³ = 3947963 is a prime.

It is not a weakly prime, because it can be changed into another prime (3947921) by changing a digit.

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 as a sum of consecutive naturals, namely, 1973985 + 1973986.

It is an arithmetic number, because the mean of its divisors is an integer number (1973986).

Almost surely, 2^3947971 is an apocalyptic number.

3947971 is a deficient number, since it is larger than the sum of its proper divisors (1).

3947971 is an equidigital number, since it uses as much as digits as its factorization.

3947971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 47628, while the sum is 40.

The square root of 3947971 is about 1986.9501755203. The cubic root of 3947971 is about 158.0488419209.

The spelling of 3947971 in words is "three million, nine hundred forty-seven thousand, nine hundred seventy-one".