388787740 has 96 divisors (see below), whose sum is σ = 929617920. Its totient is φ = 135302400.

The previous prime is 388787731. The next prime is 388787743. The reversal of 388787740 is 47787883.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (388787743) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 743119 + ... + 743641.

It is an arithmetic number, because the mean of its divisors is an integer number (9683520).

Almost surely, 2^388787740 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 388787740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (464808960).

388787740 is an abundant number, since it is smaller than the sum of its proper divisors (540830180).

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

388787740 is a wasteful number, since it uses less digits than its factorization.

388787740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 683 (or 681 counting only the distinct ones).

The product of its (nonzero) digits is 2107392, while the sum is 52.

The square root of 388787740 is about 19717.7011844687. The cubic root of 388787740 is about 729.8565678042.

The spelling of 388787740 in words is "three hundred eighty-eight million, seven hundred eighty-seven thousand, seven hundred forty".