13218863 has 4 divisors (see below), whose sum is σ = 15107280. Its totient is φ = 11330448.

The previous prime is 13218847. The next prime is 13218871. The reversal of 13218863 is 36881231.

It is a happy number.

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 13218863 - 2⁴ = 13218847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13218823) 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, 944198 + ... + 944211.

It is an arithmetic number, because the mean of its divisors is an integer number (3776820).

Almost surely, 2^13218863 is an apocalyptic number.

13218863 is a deficient number, since it is larger than the sum of its proper divisors (1888417).

13218863 is an equidigital number, since it uses as much as digits as its factorization.

13218863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1888416.

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

The square root of 13218863 is about 3635.7754331091. The cubic root of 13218863 is about 236.4456710632.

The spelling of 13218863 in words is "thirteen million, two hundred eighteen thousand, eight hundred sixty-three".