730391 has 4 divisors (see below), whose sum is σ = 753984. Its totient is φ = 706800.

The previous prime is 730363. The next prime is 730397. The reversal of 730391 is 193037.

730391 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.

It is not a de Polignac number, because 730391 - 2¹⁰ = 729367 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (730397) 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, 11750 + ... + 11811.

It is an arithmetic number, because the mean of its divisors is an integer number (188496).

2⁷³⁰³⁹¹ is an apocalyptic number.

730391 is a deficient number, since it is larger than the sum of its proper divisors (23593).

730391 is a wasteful number, since it uses less digits than its factorization.

730391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23592.

The product of its (nonzero) digits is 567, while the sum is 23.

The square root of 730391 is about 854.6291593434. The cubic root of 730391 is about 90.0572064287.

The spelling of 730391 in words is "seven hundred thirty thousand, three hundred ninety-one".