722323721 has 8 divisors (see below), whose sum is σ = 826713024. Its totient is φ = 618234480.

The previous prime is 722323711. The next prime is 722323739. The reversal of 722323721 is 127323227.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 722323721 - 2¹⁸ = 722061577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (722323711) 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 7 ways as a sum of consecutive naturals, for example, 69830 + ... + 79503.

It is an arithmetic number, because the mean of its divisors is an integer number (103339128).

Almost surely, 2^722323721 is an apocalyptic number.

It is an amenable number.

722323721 is a deficient number, since it is larger than the sum of its proper divisors (104389303).

722323721 is a wasteful number, since it uses less digits than its factorization.

722323721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150031.

The product of its digits is 7056, while the sum is 29.

The square root of 722323721 is about 26876.0808340800. The cubic root of 722323721 is about 897.2441300074.

Adding to 722323721 its reverse (127323227), we get a palindrome (849646948).

The spelling of 722323721 in words is "seven hundred twenty-two million, three hundred twenty-three thousand, seven hundred twenty-one".