13812817 has 4 divisors (see below), whose sum is σ = 13884580. Its totient is φ = 13741056.

The previous prime is 13812809. The next prime is 13812833. The reversal of 13812817 is 71821831.

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: 71821831 = 7219 ⋅9949.

It can be written as a sum of positive squares in 2 ways, for example, as 7177041 + 6635776 = 2679^2 + 2576^2 .

It is a cyclic number.

It is not a de Polignac number, because 13812817 - 2³ = 13812809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13812017) 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, 35592 + ... + 35977.

It is an arithmetic number, because the mean of its divisors is an integer number (3471145).

Almost surely, 2^13812817 is an apocalyptic number.

It is an amenable number.

13812817 is a deficient number, since it is larger than the sum of its proper divisors (71763).

13812817 is an equidigital number, since it uses as much as digits as its factorization.

13812817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71762.

The product of its digits is 2688, while the sum is 31.

The square root of 13812817 is about 3716.5598340401. The cubic root of 13812817 is about 239.9352661061.

The spelling of 13812817 in words is "thirteen million, eight hundred twelve thousand, eight hundred seventeen".