4091540 has 24 divisors (see below), whose sum is σ = 8656200. Its totient is φ = 1624448.

The previous prime is 4091537. The next prime is 4091561. The reversal of 4091540 is 451904.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 749956 + 3341584 = 866^2 + 1828^2 .

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2294 + ... + 3666.

It is an arithmetic number, because the mean of its divisors is an integer number (360675).

Almost surely, 2^4091540 is an apocalyptic number.

It is an amenable number.

4091540 is an abundant number, since it is smaller than the sum of its proper divisors (4564660).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

4091540 is a wasteful number, since it uses less digits than its factorization.

4091540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1531 (or 1529 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 4091540 is about 2022.7555462784. The cubic root of 4091540 is about 159.9419059927.

The spelling of 4091540 in words is "four million, ninety-one thousand, five hundred forty".