13218520 has 64 divisors (see below), whose sum is σ = 36002880. Its totient is φ = 4263936.

The previous prime is 13218511. The next prime is 13218529. The reversal of 13218520 is 2581231.

13218520 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (13218511) and next prime (13218529).

It is a junction number, because it is equal to n+sod(n) for n = 13218491 and 13218500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13218529) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3372 + ... + 6148.

It is an arithmetic number, because the mean of its divisors is an integer number (562545).

Almost surely, 2^13218520 is an apocalyptic number.

13218520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13218520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18001440).

13218520 is an abundant number, since it is smaller than the sum of its proper divisors (22784360).

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

13218520 is a wasteful number, since it uses less digits than its factorization.

13218520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2812 (or 2808 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 13218520 is about 3635.7282626731. The cubic root of 13218520 is about 236.4436259663.

Adding to 13218520 its reverse (2581231), we get a palindrome (15799751).

The spelling of 13218520 in words is "thirteen million, two hundred eighteen thousand, five hundred twenty".