388621992 has 96 divisors (see below), whose sum is σ = 1075767840. Its totient is φ = 116899200.

The previous prime is 388621969. The next prime is 388621999. The reversal of 388621992 is 299126883.

It is not an unprimeable number, because it can be changed into a prime (388621999) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 472942 + ... + 473762.

It is an arithmetic number, because the mean of its divisors is an integer number (11205915).

Almost surely, 2^388621992 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 388621992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (537883920).

388621992 is an abundant number, since it is smaller than the sum of its proper divisors (687145848).

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

388621992 is a wasteful number, since it uses less digits than its factorization.

388621992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1015 (or 1000 counting only the distinct ones).

The product of its digits is 373248, while the sum is 48.

The square root of 388621992 is about 19713.4977109594. The cubic root of 388621992 is about 729.7528355711.

It can be divided in two parts, 3886 and 21992, that added together give a triangular number (25878 = T₂₂₇).

The spelling of 388621992 in words is "three hundred eighty-eight million, six hundred twenty-one thousand, nine hundred ninety-two".