13947218 has 4 divisors (see below), whose sum is σ = 20920830. Its totient is φ = 6973608.

The previous prime is 13947211. The next prime is 13947221. The reversal of 13947218 is 81274931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81274931 = 103 ⋅789077.

It can be written as a sum of positive squares in only one way, i.e., 10195249 + 3751969 = 3193^2 + 1937^2 .

It is not an unprimeable number, because it can be changed into a prime (13947211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3486803 + ... + 3486806.

Almost surely, 2^13947218 is an apocalyptic number.

13947218 is a deficient number, since it is larger than the sum of its proper divisors (6973612).

13947218 is an equidigital number, since it uses as much as digits as its factorization.

13947218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6973611.

The product of its digits is 12096, while the sum is 35.

The square root of 13947218 is about 3734.5974347980. The cubic root of 13947218 is about 240.7109589557.

The spelling of 13947218 in words is "thirteen million, nine hundred forty-seven thousand, two hundred eighteen".