726268397 has 2 divisors, whose sum is σ = 726268398. Its totient is φ = 726268396.

The previous prime is 726268351. The next prime is 726268399. The reversal of 726268397 is 793862627.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 695587876 + 30680521 = 26374^2 + 5539^2 .

It is an emirp because it is prime and its reverse (793862627) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-726268397 is a prime.

Together with 726268399, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (726268399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 363134198 + 363134199.

It is an arithmetic number, because the mean of its divisors is an integer number (363134199).

Almost surely, 2^726268397 is an apocalyptic number.

It is an amenable number.

726268397 is a deficient number, since it is larger than the sum of its proper divisors (1).

726268397 is an equidigital number, since it uses as much as digits as its factorization.

726268397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1524096, while the sum is 50.

The square root of 726268397 is about 26949.3672838529. The cubic root of 726268397 is about 898.8744765670.

The spelling of 726268397 in words is "seven hundred twenty-six million, two hundred sixty-eight thousand, three hundred ninety-seven".