726589 has 2 divisors, whose sum is σ = 726590. Its totient is φ = 726588.

The previous prime is 726559. The next prime is 726599. The reversal of 726589 is 985627.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 466489 + 260100 = 683^2 + 510^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-726589 is a prime.

It is a Chen prime.

It is a nialpdrome in base 15.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (726559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 363294 + 363295.

It is an arithmetic number, because the mean of its divisors is an integer number (363295).

2⁷²⁶⁵⁸⁹ is an apocalyptic number.

It is an amenable number.

726589 is a deficient number, since it is larger than the sum of its proper divisors (1).

726589 is an equidigital number, since it uses as much as digits as its factorization.

726589 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30240, while the sum is 37.

The square root of 726589 is about 852.4019005141. The cubic root of 726589 is about 89.9006723112.

The spelling of 726589 in words is "seven hundred twenty-six thousand, five hundred eighty-nine".