3971871 has 6 divisors (see below), whose sum is σ = 5737160. Its totient is φ = 2647908.

The previous prime is 3971861. The next prime is 3971879. The reversal of 3971871 is 1781793.

It is not a de Polignac number, because 3971871 - 2⁷ = 3971743 is a prime.

It is a Duffinian number.

3971871 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3971879) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 220651 + ... + 220668.

Almost surely, 2^3971871 is an apocalyptic number.

3971871 is a deficient number, since it is larger than the sum of its proper divisors (1765289).

3971871 is a wasteful number, since it uses less digits than its factorization.

3971871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441325 (or 441322 counting only the distinct ones).

The product of its digits is 10584, while the sum is 36.

The square root of 3971871 is about 1992.9553432027. The cubic root of 3971871 is about 158.3671295047.

The spelling of 3971871 in words is "three million, nine hundred seventy-one thousand, eight hundred seventy-one".