921568 has 24 divisors (see below), whose sum is σ = 1874880. Its totient is φ = 445440.

The previous prime is 921563. The next prime is 921581. The reversal of 921568 is 865129.

921568 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is an Ulam number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (921563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 528 + ... + 1456.

It is an arithmetic number, because the mean of its divisors is an integer number (78120).

2⁹²¹⁵⁶⁸ 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 921568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (937440).

921568 is an abundant number, since it is smaller than the sum of its proper divisors (953312).

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

921568 is a wasteful number, since it uses less digits than its factorization.

921568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 970 (or 962 counting only the distinct ones).

The product of its digits is 4320, while the sum is 31.

The square root of 921568 is about 959.9833331887. The cubic root of 921568 is about 97.3141055824.

The spelling of 921568 in words is "nine hundred twenty-one thousand, five hundred sixty-eight".