3945591 has 24 divisors (see below), whose sum is σ = 6370000. Its totient is φ = 2426112.

The previous prime is 3945527. The next prime is 3945607. The reversal of 3945591 is 1955493.

It is not a de Polignac number, because 3945591 - 2⁶ = 3945527 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3945391) 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 23 ways as a sum of consecutive naturals, for example, 2535 + ... + 3783.

Almost surely, 2^3945591 is an apocalyptic number.

3945591 is a deficient number, since it is larger than the sum of its proper divisors (2424409).

3945591 is a wasteful number, since it uses less digits than its factorization.

3945591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1277 (or 1265 counting only the distinct ones).

The product of its digits is 24300, while the sum is 36.

The square root of 3945591 is about 1986.3511774105. The cubic root of 3945591 is about 158.0170760800.

The spelling of 3945591 in words is "three million, nine hundred forty-five thousand, five hundred ninety-one".