3943591 has 2 divisors, whose sum is σ = 3943592. Its totient is φ = 3943590.

The previous prime is 3943559. The next prime is 3943613. The reversal of 3943591 is 1953493.

It is a strong prime.

It is an emirp because it is prime and its reverse (1953493) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3943591 - 2⁵ = 3943559 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3943531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1971795 + 1971796.

It is an arithmetic number, because the mean of its divisors is an integer number (1971796).

Almost surely, 2^3943591 is an apocalyptic number.

3943591 is a deficient number, since it is larger than the sum of its proper divisors (1).

3943591 is an equidigital number, since it uses as much as digits as its factorization.

3943591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14580, while the sum is 34.

The square root of 3943591 is about 1985.8476779451. The cubic root of 3943591 is about 157.9903722168.

The spelling of 3943591 in words is "three million, nine hundred forty-three thousand, five hundred ninety-one".