388921330 has 24 divisors (see below), whose sum is σ = 814354668. Its totient is φ = 133344288.

The previous prime is 388921327. The next prime is 388921331. The reversal of 388921330 is 33129883.

It can be written as a sum of positive squares in 2 ways, for example, as 388838961 + 82369 = 19719^2 + 287^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 388921330.

It is not an unprimeable number, because it can be changed into a prime (388921331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 396369 + ... + 397348.

Almost surely, 2^388921330 is an apocalyptic number.

388921330 is an abundant number, since it is smaller than the sum of its proper divisors (425433338).

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

388921330 is a wasteful number, since it uses less digits than its factorization.

388921330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 793738 (or 793731 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 388921330 is about 19721.0884588047. The cubic root of 388921330 is about 729.9401527218.

The spelling of 388921330 in words is "three hundred eighty-eight million, nine hundred twenty-one thousand, three hundred thirty".