40904591 has 24 divisors (see below), whose sum is σ = 51439104. Its totient is φ = 31842720.

The previous prime is 40904569. The next prime is 40904597. The reversal of 40904591 is 19540904.

40904591 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 40904591 - 2¹⁸ = 40642447 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 (40904597) 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, 83750 + ... + 84236.

It is an arithmetic number, because the mean of its divisors is an integer number (2143296).

Almost surely, 2^40904591 is an apocalyptic number.

40904591 is a deficient number, since it is larger than the sum of its proper divisors (10534513).

40904591 is a wasteful number, since it uses less digits than its factorization.

40904591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 591 (or 578 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 40904591 is about 6395.6697069189. The cubic root of 40904591 is about 344.5540439718.

The spelling of 40904591 in words is "forty million, nine hundred four thousand, five hundred ninety-one".