3971931 has 16 divisors (see below), whose sum is σ = 5904000. Its totient is φ = 2360448.

The previous prime is 3971917. The next prime is 3971963. The reversal of 3971931 is 1391793.

It is not a de Polignac number, because 3971931 - 2⁵ = 3971899 is a prime.

It is a super-2 number, since 2×3971931² = 31552471737522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 3971892 and 3971901.

It is not an unprimeable number, because it can be changed into a prime (3971911) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1081 + ... + 3018.

It is an arithmetic number, because the mean of its divisors is an integer number (369000).

Almost surely, 2^3971931 is an apocalyptic number.

3971931 is a deficient number, since it is larger than the sum of its proper divisors (1932069).

3971931 is a wasteful number, since it uses less digits than its factorization.

3971931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4138.

The product of its digits is 5103, while the sum is 33.

The square root of 3971931 is about 1992.9703961675. The cubic root of 3971931 is about 158.3679269442.

The spelling of 3971931 in words is "three million, nine hundred seventy-one thousand, nine hundred thirty-one".