813530 has 8 divisors (see below), whose sum is σ = 1464372. Its totient is φ = 325408.

The previous prime is 813529. The next prime is 813541. The reversal of 813530 is 35318.

It can be written as a sum of positive squares in 2 ways, for example, as 808201 + 5329 = 899^2 + 73^2 .

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

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40667 + ... + 40686.

2⁸¹³⁵³⁰ is an apocalyptic number.

813530 is a deficient number, since it is larger than the sum of its proper divisors (650842).

813530 is a wasteful number, since it uses less digits than its factorization.

813530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81360.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 813530 is about 901.9589791116. The cubic root of 813530 is about 93.3521929009.

Adding to 813530 its reverse (35318), we get a palindrome (848848).

The spelling of 813530 in words is "eight hundred thirteen thousand, five hundred thirty".