726223121 has 8 divisors (see below), whose sum is σ = 782482344. Its totient is φ = 670020480.

The previous prime is 726223097. The next prime is 726223139. The reversal of 726223121 is 121322627.

It can be written as a sum of positive squares in 4 ways, for example, as 190096 + 726033025 = 436^2 + 26945^2 .

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 726223121 - 2¹⁴ = 726206737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (726223171) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14711 + ... + 40851.

It is an arithmetic number, because the mean of its divisors is an integer number (97810293).

Almost surely, 2^726223121 is an apocalyptic number.

It is an amenable number.

726223121 is a deficient number, since it is larger than the sum of its proper divisors (56259223).

726223121 is a wasteful number, since it uses less digits than its factorization.

726223121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28291.

The product of its digits is 2016, while the sum is 26.

The square root of 726223121 is about 26948.5272510392. The cubic root of 726223121 is about 898.8557973906.

Adding to 726223121 its reverse (121322627), we get a palindrome (847545748).

The spelling of 726223121 in words is "seven hundred twenty-six million, two hundred twenty-three thousand, one hundred twenty-one".