730813 has 4 divisors (see below), whose sum is σ = 773820. Its totient is φ = 687808.

The previous prime is 730811. The next prime is 730819. The reversal of 730813 is 318037.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 318037 = 41 ⋅7757.

It can be written as a sum of positive squares in 2 ways, for example, as 458329 + 272484 = 677^2 + 522^2 .

It is a cyclic number.

It is not a de Polignac number, because 730813 - 2¹ = 730811 is a prime.

It is a super-3 number, since 3×730813³ = 1170954573478433391, which contains 333 as substring.

It is a Duffinian number.

730813 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (730811) 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, 21478 + ... + 21511.

It is an arithmetic number, because the mean of its divisors is an integer number (193455).

2⁷³⁰⁸¹³ is an apocalyptic number.

It is an amenable number.

730813 is a deficient number, since it is larger than the sum of its proper divisors (43007).

730813 is a wasteful number, since it uses less digits than its factorization.

730813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43006.

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 730813 is about 854.8760144021. The cubic root of 730813 is about 90.0745472887.

The spelling of 730813 in words is "seven hundred thirty thousand, eight hundred thirteen".