729789 has 4 divisors (see below), whose sum is σ = 973056. Its totient is φ = 486524.

The previous prime is 729787. The next prime is 729791. The reversal of 729789 is 987927.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 987927 = 3 ⋅329309.

It is an interprime number because it is at equal distance from previous prime (729787) and next prime (729791).

It is a cyclic number.

It is not a de Polignac number, because 729789 - 2¹ = 729787 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 729789.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (729787) 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, 121629 + ... + 121634.

It is an arithmetic number, because the mean of its divisors is an integer number (243264).

2⁷²⁹⁷⁸⁹ is an apocalyptic number.

It is an amenable number.

729789 is a deficient number, since it is larger than the sum of its proper divisors (243267).

729789 is a wasteful number, since it uses less digits than its factorization.

729789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243266.

The product of its digits is 63504, while the sum is 42.

The square root of 729789 is about 854.2768871976. The cubic root of 729789 is about 90.0324574290.

The spelling of 729789 in words is "seven hundred twenty-nine thousand, seven hundred eighty-nine".