13218907 has 4 divisors (see below), whose sum is σ = 14235760. Its totient is φ = 12202056.

The previous prime is 13218901. The next prime is 13218923. The reversal of 13218907 is 70981231.

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

It is a cyclic number.

It is not a de Polignac number, because 13218907 - 2¹⁵ = 13186139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13218901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 508407 + ... + 508432.

It is an arithmetic number, because the mean of its divisors is an integer number (3558940).

Almost surely, 2^13218907 is an apocalyptic number.

13218907 is a deficient number, since it is larger than the sum of its proper divisors (1016853).

13218907 is a wasteful number, since it uses less digits than its factorization.

13218907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1016852.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 13218907 is about 3635.7814840829. The cubic root of 13218907 is about 236.4459334054.

The spelling of 13218907 in words is "thirteen million, two hundred eighteen thousand, nine hundred seven".