13218534 has 48 divisors (see below), whose sum is σ = 33415200. Its totient is φ = 3774960.

The previous prime is 13218533. The next prime is 13218559. The reversal of 13218534 is 43581231.

It is a happy number.

It is a super-2 number, since 2×13218534² = 349459282218312, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 13218498 and 13218507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13218533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5104 + ... + 7244.

It is an arithmetic number, because the mean of its divisors is an integer number (696150).

Almost surely, 2^13218534 is an apocalyptic number.

13218534 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 13218534, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16707600).

13218534 is an abundant number, since it is smaller than the sum of its proper divisors (20196666).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13218534 is a wasteful number, since it uses less digits than its factorization.

13218534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2170 (or 2153 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 13218534 is about 3635.7301880090. The cubic root of 13218534 is about 236.4437094404.

Adding to 13218534 its reverse (43581231), we get a palindrome (56799765).

The spelling of 13218534 in words is "thirteen million, two hundred eighteen thousand, five hundred thirty-four".