388688990 has 8 divisors (see below), whose sum is σ = 699640200. Its totient is φ = 155475592.

The previous prime is 388688981. The next prime is 388689019. The reversal of 388688990 is 99886883.

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

It is a congruent number.

It is an unprimeable number.

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, 19434440 + ... + 19434459.

It is an arithmetic number, because the mean of its divisors is an integer number (87455025).

Almost surely, 2^388688990 is an apocalyptic number.

388688990 is a deficient number, since it is larger than the sum of its proper divisors (310951210).

388688990 is a wasteful number, since it uses less digits than its factorization.

388688990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38868906.

The product of its (nonzero) digits is 5971968, while the sum is 59.

The square root of 388688990 is about 19715.1969302871. The cubic root of 388688990 is about 729.7947693543.

The spelling of 388688990 in words is "three hundred eighty-eight million, six hundred eighty-eight thousand, nine hundred ninety".