388940638 has 8 divisors (see below), whose sum is σ = 584215632. Its totient is φ = 194202096.

The previous prime is 388940599. The next prime is 388940639. The reversal of 388940638 is 836049883.

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

It is a junction number, because it is equal to n+sod(n) for n = 388940591 and 388940600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (388940639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 132295 + ... + 135202.

It is an arithmetic number, because the mean of its divisors is an integer number (73026954).

Almost surely, 2^388940638 is an apocalyptic number.

388940638 is a deficient number, since it is larger than the sum of its proper divisors (195274994).

388940638 is a wasteful number, since it uses less digits than its factorization.

388940638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268226.

The product of its (nonzero) digits is 995328, while the sum is 49.

The square root of 388940638 is about 19721.5779794620. The cubic root of 388940638 is about 729.9522318152.

The spelling of 388940638 in words is "three hundred eighty-eight million, nine hundred forty thousand, six hundred thirty-eight".