13218706 has 4 divisors (see below), whose sum is σ = 19828062. Its totient is φ = 6609352.

The previous prime is 13218701. The next prime is 13218727. The reversal of 13218706 is 60781231.

13218706 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 9357481 + 3861225 = 3059^2 + 1965^2 .

It is not an unprimeable number, because it can be changed into a prime (13218701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3304675 + ... + 3304678.

Almost surely, 2^13218706 is an apocalyptic number.

13218706 is a deficient number, since it is larger than the sum of its proper divisors (6609356).

13218706 is an equidigital number, since it uses as much as digits as its factorization.

13218706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6609355.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 13218706 is about 3635.7538420526. The cubic root of 13218706 is about 236.4447349737. Note that the first 3 decimals are identical.

Adding to 13218706 its reverse (60781231), we get a palindrome (73999937).

It can be divided in two parts, 13218 and 706, that added together give a square (13924 = 118²).

The spelling of 13218706 in words is "thirteen million, two hundred eighteen thousand, seven hundred six".