3971939 has 8 divisors (see below), whose sum is σ = 4216320. Its totient is φ = 3733576.

The previous prime is 3971917. The next prime is 3971963. The reversal of 3971939 is 9391793.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3971939 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3971896 and 3971905.

It is not an unprimeable number, because it can be changed into a prime (3971239) 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 in 7 ways as a sum of consecutive naturals, for example, 107 + ... + 2820.

It is an arithmetic number, because the mean of its divisors is an integer number (527040).

Almost surely, 2^3971939 is an apocalyptic number.

3971939 is a deficient number, since it is larger than the sum of its proper divisors (244381).

3971939 is a wasteful number, since it uses less digits than its factorization.

3971939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3009.

The product of its digits is 45927, while the sum is 41.

The square root of 3971939 is about 1992.9724032209. The cubic root of 3971939 is about 158.3680332688.

The spelling of 3971939 in words is "three million, nine hundred seventy-one thousand, nine hundred thirty-nine".