921648 has 80 divisors (see below), whose sum is σ = 2944256. Its totient is φ = 241920.

The previous prime is 921647. The next prime is 921667. The reversal of 921648 is 846129.

It is not an unprimeable number, because it can be changed into a prime (921643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4263 + ... + 4473.

2⁹²¹⁶⁴⁸ 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 921648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1472128).

921648 is an abundant number, since it is smaller than the sum of its proper divisors (2022608).

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

921648 is a wasteful number, since it uses less digits than its factorization.

921648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242 (or 236 counting only the distinct ones).

The product of its digits is 3456, while the sum is 30.

The square root of 921648 is about 960.0249996745. The cubic root of 921648 is about 97.3169214004.

The spelling of 921648 in words is "nine hundred twenty-one thousand, six hundred forty-eight".