921328 has 20 divisors (see below), whose sum is σ = 1807920. Its totient is φ = 454784.

The previous prime is 921293. The next prime is 921331. The reversal of 921328 is 823129.

921328 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

921328 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1101 + ... + 1747.

It is an arithmetic number, because the mean of its divisors is an integer number (90396).

2⁹²¹³²⁸ is an apocalyptic number.

It is an amenable number.

921328 is a deficient number, since it is larger than the sum of its proper divisors (886592).

921328 is a wasteful number, since it uses less digits than its factorization.

921328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 744 (or 738 counting only the distinct ones).

The product of its digits is 864, while the sum is 25.

The square root of 921328 is about 959.8583228790. The cubic root of 921328 is about 97.3056571507.

The spelling of 921328 in words is "nine hundred twenty-one thousand, three hundred twenty-eight".