40338638 has 8 divisors (see below), whose sum is σ = 60893832. Its totient is φ = 20040696.

The previous prime is 40338631. The next prime is 40338667. The reversal of 40338638 is 83683304.

40338638 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 junction number, because it is equal to n+sod(n) for n = 40338598 and 40338607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40338631) 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, 63920 + ... + 64547.

It is an arithmetic number, because the mean of its divisors is an integer number (7611729).

Almost surely, 2^40338638 is an apocalyptic number.

40338638 is a deficient number, since it is larger than the sum of its proper divisors (20555194).

40338638 is a wasteful number, since it uses less digits than its factorization.

40338638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128626.

The product of its (nonzero) digits is 41472, while the sum is 35.

The square root of 40338638 is about 6351.2705815451. The cubic root of 40338638 is about 342.9575832879.

The spelling of 40338638 in words is "forty million, three hundred thirty-eight thousand, six hundred thirty-eight".