3949591 has 4 divisors (see below), whose sum is σ = 3954232. Its totient is φ = 3944952.

The previous prime is 3949579. The next prime is 3949609. The reversal of 3949591 is 1959493.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1959493 = 109 ⋅17977.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3949591 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3949501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 636 + ... + 2881.

It is an arithmetic number, because the mean of its divisors is an integer number (988558).

Almost surely, 2^3949591 is an apocalyptic number.

3949591 is a deficient number, since it is larger than the sum of its proper divisors (4641).

3949591 is a wasteful number, since it uses less digits than its factorization.

3949591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4640.

The product of its digits is 43740, while the sum is 40.

The square root of 3949591 is about 1987.3577936547. The cubic root of 3949591 is about 158.0704567463.

The spelling of 3949591 in words is "three million, nine hundred forty-nine thousand, five hundred ninety-one".