726444321 has 4 divisors (see below), whose sum is σ = 968592432. Its totient is φ = 484296212.

The previous prime is 726444319. The next prime is 726444337. The reversal of 726444321 is 123444627.

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 726444321 - 2¹ = 726444319 is a prime.

It is not an unprimeable number, because it can be changed into a prime (726444311) 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 3 ways as a sum of consecutive naturals, for example, 121074051 + ... + 121074056.

It is an arithmetic number, because the mean of its divisors is an integer number (242148108).

Almost surely, 2^726444321 is an apocalyptic number.

It is an amenable number.

726444321 is a deficient number, since it is larger than the sum of its proper divisors (242148111).

726444321 is a wasteful number, since it uses less digits than its factorization.

726444321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242148110.

The product of its digits is 32256, while the sum is 33.

The square root of 726444321 is about 26952.6310589523. The cubic root of 726444321 is about 898.9470488316.

Adding to 726444321 its reverse (123444627), we get a palindrome (849888948).

The spelling of 726444321 in words is "seven hundred twenty-six million, four hundred forty-four thousand, three hundred twenty-one".