729243989 has 8 divisors (see below), whose sum is σ = 751358040. Its totient is φ = 707256576.

The previous prime is 729243973. The next prime is 729244001. The reversal of 729243989 is 989342927.

It can be written as a sum of positive squares in 4 ways, for example, as 64480900 + 664763089 = 8030^2 + 25783^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 729243989 - 2⁴ = 729243973 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 729243989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (729243929) 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 in 7 ways as a sum of consecutive naturals, for example, 19904 + ... + 43065.

It is an arithmetic number, because the mean of its divisors is an integer number (93919755).

Almost surely, 2^729243989 is an apocalyptic number.

It is an amenable number.

729243989 is a deficient number, since it is larger than the sum of its proper divisors (22114051).

729243989 is a wasteful number, since it uses less digits than its factorization.

729243989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63319.

The product of its digits is 1959552, while the sum is 53.

The square root of 729243989 is about 27004.5179368194. The cubic root of 729243989 is about 900.1003957962.

The spelling of 729243989 in words is "seven hundred twenty-nine million, two hundred forty-three thousand, nine hundred eighty-nine".