7322721 has 16 divisors (see below), whose sum is σ = 11212800. Its totient is φ = 4164048.

The previous prime is 7322683. The next prime is 7322743. The reversal of 7322721 is 1272237.

7322721 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 7322721 - 2⁷ = 7322593 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 7322691 and 7322700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7322221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4290 + ... + 5748.

It is an arithmetic number, because the mean of its divisors is an integer number (700800).

Almost surely, 2^7322721 is an apocalyptic number.

It is an amenable number.

7322721 is a deficient number, since it is larger than the sum of its proper divisors (3890079).

7322721 is a wasteful number, since it uses less digits than its factorization.

7322721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1708.

The product of its digits is 1176, while the sum is 24.

The square root of 7322721 is about 2706.0526602415. The cubic root of 7322721 is about 194.1887930806.

Adding to 7322721 its reverse (1272237), we get a palindrome (8594958).

The spelling of 7322721 in words is "seven million, three hundred twenty-two thousand, seven hundred twenty-one".