13218878 has 4 divisors (see below), whose sum is σ = 19828320. Its totient is φ = 6609438.

The previous prime is 13218871. The next prime is 13218893. The reversal of 13218878 is 87881231.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13218871) 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 as a sum of consecutive naturals, namely, 3304718 + ... + 3304721.

It is an arithmetic number, because the mean of its divisors is an integer number (4957080).

Almost surely, 2^13218878 is an apocalyptic number.

13218878 is a deficient number, since it is larger than the sum of its proper divisors (6609442).

13218878 is an equidigital number, since it uses as much as digits as its factorization.

13218878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6609441.

The product of its digits is 21504, while the sum is 38.

The square root of 13218878 is about 3635.7774959422. Note that the first 3 decimals coincide. The cubic root of 13218878 is about 236.4457604981.

The spelling of 13218878 in words is "thirteen million, two hundred eighteen thousand, eight hundred seventy-eight".