3943931 has 2 divisors, whose sum is σ = 3943932. Its totient is φ = 3943930.

The previous prime is 3943921. The next prime is 3943937. The reversal of 3943931 is 1393493.

It is a strong prime.

It is an emirp because it is prime and its reverse (1393493) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3943931 - 2¹⁰ = 3942907 is a prime.

It is a super-2 number, since 2×3943931² = 31109183465522, which contains 22 as substring.

It is a Chen prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (3943937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1971965 + 1971966.

It is an arithmetic number, because the mean of its divisors is an integer number (1971966).

Almost surely, 2^3943931 is an apocalyptic number.

3943931 is a deficient number, since it is larger than the sum of its proper divisors (1).

3943931 is an equidigital number, since it uses as much as digits as its factorization.

3943931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8748, while the sum is 32.

The square root of 3943931 is about 1985.9332818602. The cubic root of 3943931 is about 157.9949125104.

The spelling of 3943931 in words is "three million, nine hundred forty-three thousand, nine hundred thirty-one".