4090591 has 4 divisors (see below), whose sum is σ = 4331232. Its totient is φ = 3849952.

The previous prime is 4090589. The next prime is 4090637. The reversal of 4090591 is 1950904.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 4090591 - 2¹ = 4090589 is a prime.

It is an Ulam number.

It is a Duffinian number.

4090591 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4090511) 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, 120295 + ... + 120328.

It is an arithmetic number, because the mean of its divisors is an integer number (1082808).

Almost surely, 2^4090591 is an apocalyptic number.

4090591 is a deficient number, since it is larger than the sum of its proper divisors (240641).

4090591 is a wasteful number, since it uses less digits than its factorization.

4090591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240640.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 4090591 is about 2022.5209516838. The cubic root of 4090591 is about 159.9295392876.

It can be divided in two parts, 409059 and 1, that added together give a triangular number (409060 = T₉₀₄).

The spelling of 4090591 in words is "four million, ninety thousand, five hundred ninety-one".