3931871 has 4 divisors (see below), whose sum is σ = 3936744. Its totient is φ = 3927000.

The previous prime is 3931861. The next prime is 3931891. The reversal of 3931871 is 1781393.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 3931871 - 2¹⁴ = 3915487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3931801) 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 in 3 ways as a sum of consecutive naturals, for example, 905 + ... + 2946.

It is an arithmetic number, because the mean of its divisors is an integer number (984186).

Almost surely, 2^3931871 is an apocalyptic number.

3931871 is a deficient number, since it is larger than the sum of its proper divisors (4873).

3931871 is a wasteful number, since it uses less digits than its factorization.

3931871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4872.

The product of its digits is 4536, while the sum is 32.

The square root of 3931871 is about 1982.8946013341. The cubic root of 3931871 is about 157.8337058260.

The spelling of 3931871 in words is "three million, nine hundred thirty-one thousand, eight hundred seventy-one".