726735121 has 6 divisors (see below), whose sum is σ = 845385810. Its totient is φ = 622915776.

The previous prime is 726735089. The next prime is 726735137. The reversal of 726735121 is 121537627.

It can be written as a sum of positive squares in only one way, i.e., 716900625 + 9834496 = 26775^2 + 3136^2 .

It is not a de Polignac number, because 726735121 - 2⁵ = 726735089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (726736121) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7415616 + ... + 7415713.

It is an arithmetic number, because the mean of its divisors is an integer number (140897635).

Almost surely, 2^726735121 is an apocalyptic number.

It is an amenable number.

726735121 is a deficient number, since it is larger than the sum of its proper divisors (118650689).

726735121 is a wasteful number, since it uses less digits than its factorization.

726735121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14831343 (or 14831336 counting only the distinct ones).

The product of its digits is 17640, while the sum is 34.

The square root of 726735121 is about 26958.0251687693. The cubic root of 726735121 is about 899.0669841201.

The spelling of 726735121 in words is "seven hundred twenty-six million, seven hundred thirty-five thousand, one hundred twenty-one".