13218873 has 4 divisors (see below), whose sum is σ = 17625168. Its totient is φ = 8812580.

The previous prime is 13218871. The next prime is 13218893. The reversal of 13218873 is 37881231.

13218873 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 semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13218873 - 2¹ = 13218871 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13218871) 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, 2203143 + ... + 2203148.

It is an arithmetic number, because the mean of its divisors is an integer number (4406292).

Almost surely, 2^13218873 is an apocalyptic number.

It is an amenable number.

13218873 is a deficient number, since it is larger than the sum of its proper divisors (4406295).

13218873 is an equidigital number, since it uses as much as digits as its factorization.

13218873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4406294.

The product of its digits is 8064, while the sum is 33.

The square root of 13218873 is about 3635.7768083313. The cubic root of 13218873 is about 236.4457306865.

The spelling of 13218873 in words is "thirteen million, two hundred eighteen thousand, eight hundred seventy-three".