728939 has 8 divisors (see below), whose sum is σ = 780192. Its totient is φ = 679360.

The previous prime is 728929. The next prime is 728941. The reversal of 728939 is 939827.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-728939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (728929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 557 + ... + 1329.

It is an arithmetic number, because the mean of its divisors is an integer number (97524).

2⁷²⁸⁹³⁹ is an apocalyptic number.

728939 is a deficient number, since it is larger than the sum of its proper divisors (51253).

728939 is a wasteful number, since it uses less digits than its factorization.

728939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 837.

The product of its digits is 27216, while the sum is 38.

The square root of 728939 is about 853.7792454727. The cubic root of 728939 is about 89.9974896419.

The spelling of 728939 in words is "seven hundred twenty-eight thousand, nine hundred thirty-nine".