13218938 has 8 divisors (see below), whose sum is σ = 20250432. Its totient is φ = 6468796.

The previous prime is 13218937. The next prime is 13218943. The reversal of 13218938 is 83981231.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 13218898 and 13218907.

It is not an unprimeable number, because it can be changed into a prime (13218937) 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, 70220 + ... + 70407.

It is an arithmetic number, because the mean of its divisors is an integer number (2531304).

Almost surely, 2^13218938 is an apocalyptic number.

13218938 is a deficient number, since it is larger than the sum of its proper divisors (7031494).

13218938 is a wasteful number, since it uses less digits than its factorization.

13218938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140676.

The product of its digits is 10368, while the sum is 35.

The square root of 13218938 is about 3635.7857472629. The cubic root of 13218938 is about 236.4461182371.

The spelling of 13218938 in words is "thirteen million, two hundred eighteen thousand, nine hundred thirty-eight".