321928 has 8 divisors (see below), whose sum is σ = 603630. Its totient is φ = 160960.

The previous prime is 321911. The next prime is 321947. The reversal of 321928 is 829123.

It can be written as a sum of positive squares in only one way, i.e., 315844 + 6084 = 562^2 + 78^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

321928 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 as a sum of consecutive naturals, namely, 20113 + ... + 20128.

2³²¹⁹²⁸ is an apocalyptic number.

It is an amenable number.

321928 is a deficient number, since it is larger than the sum of its proper divisors (281702).

321928 is a wasteful number, since it uses less digits than its factorization.

321928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40247 (or 40243 counting only the distinct ones).

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

The square root of 321928 is about 567.3869931537. The cubic root of 321928 is about 68.5361309737.

The spelling of 321928 in words is "three hundred twenty-one thousand, nine hundred twenty-eight".