13218864 has 20 divisors (see below), whose sum is σ = 34148856. Its totient is φ = 4406272.

The previous prime is 13218847. The next prime is 13218871. The reversal of 13218864 is 46881231.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137649 + ... + 137744.

Almost surely, 2^13218864 is an apocalyptic number.

It is an amenable number.

13218864 is an abundant number, since it is smaller than the sum of its proper divisors (20929992).

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

13218864 is a wasteful number, since it uses less digits than its factorization.

13218864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275404 (or 275398 counting only the distinct ones).

The product of its digits is 9216, while the sum is 33.

The square root of 13218864 is about 3635.7755706314. The cubic root of 13218864 is about 236.4456770255.

The spelling of 13218864 in words is "thirteen million, two hundred eighteen thousand, eight hundred sixty-four".