13218009 has 8 divisors (see below), whose sum is σ = 20141760. Its totient is φ = 7553136.

The previous prime is 13217969. The next prime is 13218019. The reversal of 13218009 is 90081231.

13218009 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-13218009 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13218009.

It is not an unprimeable number, because it can be changed into a prime (13218019) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 314694 + ... + 314735.

It is an arithmetic number, because the mean of its divisors is an integer number (2517720).

Almost surely, 2^13218009 is an apocalyptic number.

It is an amenable number.

13218009 is a deficient number, since it is larger than the sum of its proper divisors (6923751).

13218009 is an equidigital number, since it uses as much as digits as its factorization.

13218009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 629439.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 13218009 is about 3635.6579872150. The cubic root of 13218009 is about 236.4405791237.

The spelling of 13218009 in words is "thirteen million, two hundred eighteen thousand, nine".