40436591 has 24 divisors (see below), whose sum is σ = 47449920. Its totient is φ = 34232832.

The previous prime is 40436581. The next prime is 40436593. The reversal of 40436591 is 19563404.

40436591 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-40436591 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 (40436593) 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, 176465 + ... + 176693.

It is an arithmetic number, because the mean of its divisors is an integer number (1977080).

Almost surely, 2^40436591 is an apocalyptic number.

40436591 is a deficient number, since it is larger than the sum of its proper divisors (7013329).

40436591 is a wasteful number, since it uses less digits than its factorization.

40436591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323 (or 306 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 40436591 is about 6358.9771976317. The cubic root of 40436591 is about 343.2349564710.

Adding to 40436591 its reverse (19563404), we get a palindrome (59999995).

The spelling of 40436591 in words is "forty million, four hundred thirty-six thousand, five hundred ninety-one".