726689 has 2 divisors, whose sum is σ = 726690. Its totient is φ = 726688.

The previous prime is 726679. The next prime is 726697. The reversal of 726689 is 986627.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 672400 + 54289 = 820^2 + 233^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-726689 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (726619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 363344 + 363345.

It is an arithmetic number, because the mean of its divisors is an integer number (363345).

2⁷²⁶⁶⁸⁹ is an apocalyptic number.

It is an amenable number.

726689 is a deficient number, since it is larger than the sum of its proper divisors (1).

726689 is an equidigital number, since it uses as much as digits as its factorization.

726689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 38.

The square root of 726689 is about 852.4605562723. The cubic root of 726689 is about 89.9047964469.

The spelling of 726689 in words is "seven hundred twenty-six thousand, six hundred eighty-nine".