928391321 has 16 divisors (see below), whose sum is σ = 1091579328. Its totient is φ = 778440000.

The previous prime is 928391311. The next prime is 928391327. The reversal of 928391321 is 123193829.

It is a de Polignac number, because none of the positive numbers 2^k-928391321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (928391327) 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, 283946 + ... + 287196.

It is an arithmetic number, because the mean of its divisors is an integer number (68223708).

Almost surely, 2^928391321 is an apocalyptic number.

It is an amenable number.

928391321 is a deficient number, since it is larger than the sum of its proper divisors (163188007).

928391321 is a wasteful number, since it uses less digits than its factorization.

928391321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5272.

The product of its digits is 23328, while the sum is 38.

The square root of 928391321 is about 30469.5146170726. The cubic root of 928391321 is about 975.5368758294.

The spelling of 928391321 in words is "nine hundred twenty-eight million, three hundred ninety-one thousand, three hundred twenty-one".