728239 has 4 divisors (see below), whose sum is σ = 730656. Its totient is φ = 725824.

The previous prime is 728209. The next prime is 728261. The reversal of 728239 is 932827.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 932827 = 7 ⋅133261.

It is a cyclic number.

It is not a de Polignac number, because 728239 - 2⁵ = 728207 is a prime.

It is a super-2 number, since 2×728239² = 1060664082242, which contains 22 as substring.

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 728239.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728209) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 679 + ... + 1384.

It is an arithmetic number, because the mean of its divisors is an integer number (182664).

2⁷²⁸²³⁹ is an apocalyptic number.

728239 is a deficient number, since it is larger than the sum of its proper divisors (2417).

728239 is a wasteful number, since it uses less digits than its factorization.

728239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2416.

The product of its digits is 6048, while the sum is 31.

The square root of 728239 is about 853.3692049752. The cubic root of 728239 is about 89.9686722241.

The spelling of 728239 in words is "seven hundred twenty-eight thousand, two hundred thirty-nine".