13218944 has 32 divisors (see below), whose sum is σ = 26782140. Its totient is φ = 6497280.

The previous prime is 13218943. The next prime is 13218967. The reversal of 13218944 is 44981231.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 11560000 + 1658944 = 3400^2 + 1288^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a self number, because there is not a number n which added to its sum of digits gives 13218944.

It is not an unprimeable number, because it can be changed into a prime (13218943) 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, 6962 + ... + 8654.

Almost surely, 2^13218944 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13218944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13391070).

13218944 is an abundant number, since it is smaller than the sum of its proper divisors (13563196).

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

13218944 is an equidigital number, since it uses as much as digits as its factorization.

13218944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1768 (or 1756 counting only the distinct ones).

The product of its digits is 6912, while the sum is 32.

The square root of 13218944 is about 3635.7865723939. The cubic root of 13218944 is about 236.4461540110.

The spelling of 13218944 in words is "thirteen million, two hundred eighteen thousand, nine hundred forty-four".