13004813 has 4 divisors (see below), whose sum is σ = 13769820. Its totient is φ = 12239808.

The previous prime is 13004809. The next prime is 13004819. The reversal of 13004813 is 31840031.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31840031 = 17 ⋅1872943.

It can be written as a sum of positive squares in 2 ways, for example, as 8282884 + 4721929 = 2878^2 + 2173^2 .

It is a cyclic number.

It is not a de Polignac number, because 13004813 - 2² = 13004809 is a prime.

It is a super-2 number, since 2×13004813² = 338250322329938, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13004819) 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, 382478 + ... + 382511.

It is an arithmetic number, because the mean of its divisors is an integer number (3442455).

Almost surely, 2^13004813 is an apocalyptic number.

It is an amenable number.

13004813 is a deficient number, since it is larger than the sum of its proper divisors (765007).

13004813 is an equidigital number, since it uses as much as digits as its factorization.

13004813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 765006.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 13004813 is about 3606.2186567095. The cubic root of 13004813 is about 235.1624830734.

Adding to 13004813 its reverse (31840031), we get a palindrome (44844844).

The spelling of 13004813 in words is "thirteen million, four thousand, eight hundred thirteen".