40540439 has 4 divisors (see below), whose sum is σ = 40850040. Its totient is φ = 40230840.

The previous prime is 40540391. The next prime is 40540441. The reversal of 40540439 is 93404504.

40540439 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 40540439 - 2¹² = 40536343 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 (40540499) 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 3 ways as a sum of consecutive naturals, for example, 154604 + ... + 154865.

It is an arithmetic number, because the mean of its divisors is an integer number (10212510).

Almost surely, 2^40540439 is an apocalyptic number.

40540439 is a deficient number, since it is larger than the sum of its proper divisors (309601).

40540439 is a wasteful number, since it uses less digits than its factorization.

40540439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309600.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 40540439 is about 6367.1374258767. The cubic root of 40540439 is about 343.5285337553.

The spelling of 40540439 in words is "forty million, five hundred forty thousand, four hundred thirty-nine".