40440638 has 8 divisors (see below), whose sum is σ = 69326832. Its totient is φ = 17331696.

The previous prime is 40440629. The next prime is 40440661. The reversal of 40440638 is 83604404.

40440638 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 40440638.

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 3 ways as a sum of consecutive naturals, for example, 1444295 + ... + 1444322.

It is an arithmetic number, because the mean of its divisors is an integer number (8665854).

Almost surely, 2^40440638 is an apocalyptic number.

40440638 is a deficient number, since it is larger than the sum of its proper divisors (28886194).

40440638 is a wasteful number, since it uses less digits than its factorization.

40440638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2888626.

The product of its (nonzero) digits is 9216, while the sum is 29.

The square root of 40440638 is about 6359.2954012217. The cubic root of 40440638 is about 343.2464067070.

The spelling of 40440638 in words is "forty million, four hundred forty thousand, six hundred thirty-eight".