4320321 has 4 divisors (see below), whose sum is σ = 5760432. Its totient is φ = 2880212.

The previous prime is 4320319. The next prime is 4320341. The reversal of 4320321 is 1230234.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 4320321 - 2¹ = 4320319 is a prime.

It is a super-3 number, since 3×4320321³ (a number of 21 digits) contains 333 as substring.

It is an Ulam number.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 4320321.

It is not an unprimeable number, because it can be changed into a prime (4320311) 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, 720051 + ... + 720056.

It is an arithmetic number, because the mean of its divisors is an integer number (1440108).

Almost surely, 2^4320321 is an apocalyptic number.

It is an amenable number.

4320321 is a deficient number, since it is larger than the sum of its proper divisors (1440111).

4320321 is a wasteful number, since it uses less digits than its factorization.

4320321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1440110.

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 4320321 is about 2078.5381882467. The cubic root of 4320321 is about 162.8690908220.

Adding to 4320321 its reverse (1230234), we get a palindrome (5550555).

The spelling of 4320321 in words is "four million, three hundred twenty thousand, three hundred twenty-one".