13218408 has 48 divisors (see below), whose sum is σ = 40915680. Its totient is φ = 3776544.

The previous prime is 13218407. The next prime is 13218409. The reversal of 13218408 is 80481231.

It is an interprime number because it is at equal distance from previous prime (13218407) and next prime (13218409).

It is not an unprimeable number, because it can be changed into a prime (13218407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12610 + ... + 13617.

It is an arithmetic number, because the mean of its divisors is an integer number (852410).

Almost surely, 2^13218408 is an apocalyptic number.

13218408 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

13218408 is an abundant number, since it is smaller than the sum of its proper divisors (27697272).

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

13218408 is a wasteful number, since it uses less digits than its factorization.

13218408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26246 (or 26239 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 13218408 is about 3635.7128599492. The cubic root of 13218408 is about 236.4429581719.

Adding to 13218408 its reverse (80481231), we get a palindrome (93699639).

The spelling of 13218408 in words is "thirteen million, two hundred eighteen thousand, four hundred eight".