3991941 has 12 divisors (see below), whose sum is σ = 5809440. Its totient is φ = 2641320.

The previous prime is 3991891. The next prime is 3991943. The reversal of 3991941 is 1491993.

It is not a de Polignac number, because 3991941 - 2⁶ = 3991877 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 3991896 and 3991905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3991943) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 345 + ... + 2846.

It is an arithmetic number, because the mean of its divisors is an integer number (484120).

Almost surely, 2^3991941 is an apocalyptic number.

It is an amenable number.

3991941 is a deficient number, since it is larger than the sum of its proper divisors (1817499).

3991941 is a wasteful number, since it uses less digits than its factorization.

3991941 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3336 (or 3333 counting only the distinct ones).

The product of its digits is 8748, while the sum is 36.

The square root of 3991941 is about 1997.9842341720. The cubic root of 3991941 is about 158.6334263120.

The spelling of 3991941 in words is "three million, nine hundred ninety-one thousand, nine hundred forty-one".