729821489 has 4 divisors (see below), whose sum is σ = 731222820. Its totient is φ = 728420160.

The previous prime is 729821467. The next prime is 729821531. The reversal of 729821489 is 984128927.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 467640625 + 262180864 = 21625^2 + 16192^2 .

It is a cyclic number.

It is not a de Polignac number, because 729821489 - 2²⁴ = 713044273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (729821459) 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 in 3 ways as a sum of consecutive naturals, for example, 699884 + ... + 700925.

It is an arithmetic number, because the mean of its divisors is an integer number (182805705).

Almost surely, 2^729821489 is an apocalyptic number.

It is an amenable number.

729821489 is a deficient number, since it is larger than the sum of its proper divisors (1401331).

729821489 is a wasteful number, since it uses less digits than its factorization.

729821489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1401330.

The product of its digits is 580608, while the sum is 50.

The square root of 729821489 is about 27015.2084759678. The cubic root of 729821489 is about 900.3379344125.

The spelling of 729821489 in words is "seven hundred twenty-nine million, eight hundred twenty-one thousand, four hundred eighty-nine".