921328384 has 72 divisors (see below), whose sum is σ = 1916127360. Its totient is φ = 441753600.

The previous prime is 921328361. The next prime is 921328391. The reversal of 921328384 is 483823129.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 639537 + ... + 640975.

It is an arithmetic number, because the mean of its divisors is an integer number (26612880).

Almost surely, 2^921328384 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 921328384, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (958063680).

921328384 is an abundant number, since it is smaller than the sum of its proper divisors (994798976).

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

921328384 is a wasteful number, since it uses less digits than its factorization.

921328384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1557 (or 1543 counting only the distinct ones).

The product of its digits is 82944, while the sum is 40.

The square root of 921328384 is about 30353.3916391562. The cubic root of 921328384 is about 973.0567066934.

The spelling of 921328384 in words is "nine hundred twenty-one million, three hundred twenty-eight thousand, three hundred eighty-four".