726605389 has 2 divisors, whose sum is σ = 726605390. Its totient is φ = 726605388.

The previous prime is 726605339. The next prime is 726605417. The reversal of 726605389 is 983506627.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 481056489 + 245548900 = 21933^2 + 15670^2 .

It is a cyclic number.

It is not a de Polignac number, because 726605389 - 2²⁵ = 693050957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (726605339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 363302694 + 363302695.

It is an arithmetic number, because the mean of its divisors is an integer number (363302695).

Almost surely, 2^726605389 is an apocalyptic number.

It is an amenable number.

726605389 is a deficient number, since it is larger than the sum of its proper divisors (1).

726605389 is an equidigital number, since it uses as much as digits as its factorization.

726605389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 544320, while the sum is 46.

The square root of 726605389 is about 26955.6188762195. The cubic root of 726605389 is about 899.0134824174.

The spelling of 726605389 in words is "seven hundred twenty-six million, six hundred five thousand, three hundred eighty-nine".