8729813 has 4 divisors (see below), whose sum is σ = 8740140. Its totient is φ = 8719488.

The previous prime is 8729801. The next prime is 8729821. The reversal of 8729813 is 3189278.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3189278 = 2 ⋅1594639.

It can be written as a sum of positive squares in 2 ways, for example, as 97969 + 8631844 = 313^2 + 2938^2 .

It is a cyclic number.

It is not a de Polignac number, because 8729813 - 2⁸ = 8729557 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8725813) by changing a digit.

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, 3770 + ... + 5627.

It is an arithmetic number, because the mean of its divisors is an integer number (2185035).

Almost surely, 2^8729813 is an apocalyptic number.

It is an amenable number.

8729813 is a deficient number, since it is larger than the sum of its proper divisors (10327).

8729813 is an equidigital number, since it uses as much as digits as its factorization.

8729813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10326.

The product of its digits is 24192, while the sum is 38.

The square root of 8729813 is about 2954.6256954139. The cubic root of 8729813 is about 205.9056736592.

The spelling of 8729813 in words is "eight million, seven hundred twenty-nine thousand, eight hundred thirteen".