4322721 has 16 divisors (see below), whose sum is σ = 6245120. Its totient is φ = 2643840.

The previous prime is 4322713. The next prime is 4322741. The reversal of 4322721 is 1272234.

It is not a de Polignac number, because 4322721 - 2³ = 4322713 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (4322701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10365 + ... + 10773.

It is an arithmetic number, because the mean of its divisors is an integer number (390320).

Almost surely, 2^4322721 is an apocalyptic number.

It is an amenable number.

4322721 is a deficient number, since it is larger than the sum of its proper divisors (1922399).

4322721 is a wasteful number, since it uses less digits than its factorization.

4322721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 696.

The product of its digits is 672, while the sum is 21.

The square root of 4322721 is about 2079.1154369106. The cubic root of 4322721 is about 162.8992439409.

Adding to 4322721 its reverse (1272234), we get a palindrome (5594955).

The spelling of 4322721 in words is "four million, three hundred twenty-two thousand, seven hundred twenty-one".