3990591 has 24 divisors (see below), whose sum is σ = 6351696. Its totient is φ = 2394240.

The previous prime is 3990541. The next prime is 3990593. The reversal of 3990591 is 1950993.

It is not a de Polignac number, because 3990591 - 2⁷ = 3990463 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3990593) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17011 + ... + 17243.

It is an arithmetic number, because the mean of its divisors is an integer number (264654).

Almost surely, 2^3990591 is an apocalyptic number.

3990591 is a deficient number, since it is larger than the sum of its proper divisors (2361105).

3990591 is a wasteful number, since it uses less digits than its factorization.

3990591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423 (or 420 counting only the distinct ones).

The product of its (nonzero) digits is 10935, while the sum is 36.

The square root of 3990591 is about 1997.6463651007. The cubic root of 3990591 is about 158.6155420070.

The spelling of 3990591 in words is "three million, nine hundred ninety thousand, five hundred ninety-one".