723239989 has 2 divisors, whose sum is σ = 723239990. Its totient is φ = 723239988.

The previous prime is 723239983. The next prime is 723240031. The reversal of 723239989 is 989932327.

723239989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 473062500 + 250177489 = 21750^2 + 15817^2 .

It is a cyclic number.

It is not a de Polignac number, because 723239989 - 2⁷ = 723239861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (723239983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 361619994 + 361619995.

It is an arithmetic number, because the mean of its divisors is an integer number (361619995).

Almost surely, 2^723239989 is an apocalyptic number.

It is an amenable number.

723239989 is a deficient number, since it is larger than the sum of its proper divisors (1).

723239989 is an equidigital number, since it uses as much as digits as its factorization.

723239989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1469664, while the sum is 52.

The square root of 723239989 is about 26893.1215927047. The cubic root of 723239989 is about 897.6233545790.

The spelling of 723239989 in words is "seven hundred twenty-three million, two hundred thirty-nine thousand, nine hundred eighty-nine".