323921 has 4 divisors (see below), whose sum is σ = 348852. Its totient is φ = 298992.

The previous prime is 323903. The next prime is 323923. The reversal of 323921 is 129323.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 129323 = 79 ⋅1637.

It can be written as a sum of positive squares in 2 ways, for example, as 130321 + 193600 = 361^2 + 440^2 .

It is a cyclic number.

It is not a de Polignac number, because 323921 - 2¹⁴ = 307537 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 323893 and 323902.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 323921.

It is not an unprimeable number, because it can be changed into a prime (323923) 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, 12446 + ... + 12471.

It is an arithmetic number, because the mean of its divisors is an integer number (87213).

2³²³⁹²¹ is an apocalyptic number.

It is an amenable number.

323921 is a deficient number, since it is larger than the sum of its proper divisors (24931).

323921 is a wasteful number, since it uses less digits than its factorization.

323921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24930.

The product of its digits is 324, while the sum is 20.

The square root of 323921 is about 569.1405801733. The cubic root of 323921 is about 68.6772718510.

The spelling of 323921 in words is "three hundred twenty-three thousand, nine hundred twenty-one".