13218423 has 4 divisors (see below), whose sum is σ = 17624568. Its totient is φ = 8812280.

The previous prime is 13218409. The next prime is 13218463. The reversal of 13218423 is 32481231.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13218423 - 2⁴ = 13218407 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13218393 and 13218402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13218463) 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, 2203068 + ... + 2203073.

It is an arithmetic number, because the mean of its divisors is an integer number (4406142).

Almost surely, 2^13218423 is an apocalyptic number.

13218423 is a deficient number, since it is larger than the sum of its proper divisors (4406145).

13218423 is an equidigital number, since it uses as much as digits as its factorization.

13218423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4406144.

The product of its digits is 1152, while the sum is 24.

The square root of 13218423 is about 3635.7149228178. The cubic root of 13218423 is about 236.4430476089.

Adding to 13218423 its reverse (32481231), we get a palindrome (45699654).

The spelling of 13218423 in words is "thirteen million, two hundred eighteen thousand, four hundred twenty-three".