4431321 has 16 divisors (see below), whose sum is σ = 6726720. Its totient is φ = 2881440.

The previous prime is 4431311. The next prime is 4431367. The reversal of 4431321 is 1231344.

It is not a de Polignac number, because 4431321 - 2⁵ = 4431289 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 4431294 and 4431303.

It is not an unprimeable number, because it can be changed into a prime (4431311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 895 + ... + 3108.

It is an arithmetic number, because the mean of its divisors is an integer number (420420).

Almost surely, 2^4431321 is an apocalyptic number.

4431321 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

4431321 is a deficient number, since it is larger than the sum of its proper divisors (2295399).

4431321 is a wasteful number, since it uses less digits than its factorization.

4431321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4053 (or 4047 counting only the distinct ones).

The product of its digits is 288, while the sum is 18.

The square root of 4431321 is about 2105.0703076145. The cubic root of 4431321 is about 164.2521527626.

Adding to 4431321 its reverse (1231344), we get a palindrome (5662665).

It can be divided in two parts, 443 and 1321, that added together give a square (1764 = 42²).

The spelling of 4431321 in words is "four million, four hundred thirty-one thousand, three hundred twenty-one".