730439 has 4 divisors (see below), whose sum is σ = 773424. Its totient is φ = 687456.

The previous prime is 730421. The next prime is 730447. The reversal of 730439 is 934037.

730439 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 934037 = 13 ⋅71849.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-730439 is a prime.

It is a super-2 number, since 2×730439² = 1067082265442, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (730459) 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, 21467 + ... + 21500.

It is an arithmetic number, because the mean of its divisors is an integer number (193356).

2⁷³⁰⁴³⁹ is an apocalyptic number.

730439 is a deficient number, since it is larger than the sum of its proper divisors (42985).

730439 is a wasteful number, since it uses less digits than its factorization.

730439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42984.

The product of its (nonzero) digits is 2268, while the sum is 26.

The square root of 730439 is about 854.6572412377. The cubic root of 730439 is about 90.0591791854.

The spelling of 730439 in words is "seven hundred thirty thousand, four hundred thirty-nine".