388685720 has 16 divisors (see below), whose sum is σ = 874542960. Its totient is φ = 155474272.

The previous prime is 388685683. The next prime is 388685743. The reversal of 388685720 is 27586883.

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, 4858532 + ... + 4858611.

It is an arithmetic number, because the mean of its divisors is an integer number (54658935).

Almost surely, 2^388685720 is an apocalyptic number.

It is an amenable number.

388685720 is an abundant number, since it is smaller than the sum of its proper divisors (485857240).

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

388685720 is a wasteful number, since it uses less digits than its factorization.

388685720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9717154 (or 9717150 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 47.

The square root of 388685720 is about 19715.1139991632. The cubic root of 388685720 is about 729.7927227861.

The spelling of 388685720 in words is "three hundred eighty-eight million, six hundred eighty-five thousand, seven hundred twenty".