388919090 has 32 divisors (see below), whose sum is σ = 818674560. Its totient is φ = 130241664.

The previous prime is 388919077. The next prime is 388919093. The reversal of 388919090 is 90919883.

It is not an unprimeable number, because it can be changed into a prime (388919093) 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 15 ways as a sum of consecutive naturals, for example, 61595 + ... + 67614.

It is an arithmetic number, because the mean of its divisors is an integer number (25583580).

Almost surely, 2^388919090 is an apocalyptic number.

388919090 is an abundant number, since it is smaller than the sum of its proper divisors (429755470).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

388919090 is a wasteful number, since it uses less digits than its factorization.

388919090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129266.

The product of its (nonzero) digits is 139968, while the sum is 47.

The square root of 388919090 is about 19721.0316667258. The cubic root of 388919090 is about 729.9387513509.

The spelling of 388919090 in words is "three hundred eighty-eight million, nine hundred nineteen thousand, ninety".