726038221 has 4 divisors (see below), whose sum is σ = 732463452. Its totient is φ = 719612992.

The previous prime is 726038207. The next prime is 726038231. The reversal of 726038221 is 122830627.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 59675625 + 666362596 = 7725^2 + 25814^2 .

It is a cyclic number.

It is not a de Polignac number, because 726038221 - 2⁵ = 726038189 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (726038231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3212446 + ... + 3212671.

It is an arithmetic number, because the mean of its divisors is an integer number (183115863).

Almost surely, 2^726038221 is an apocalyptic number.

It is an amenable number.

726038221 is a deficient number, since it is larger than the sum of its proper divisors (6425231).

726038221 is a wasteful number, since it uses less digits than its factorization.

726038221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6425230.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 726038221 is about 26945.0964184580. The cubic root of 726038221 is about 898.7795065376.

Adding to 726038221 its reverse (122830627), we get a palindrome (848868848).

The spelling of 726038221 in words is "seven hundred twenty-six million, thirty-eight thousand, two hundred twenty-one".