13218727 has 2 divisors, whose sum is σ = 13218728. Its totient is φ = 13218726.

The previous prime is 13218701. The next prime is 13218743. The reversal of 13218727 is 72781231.

It is a strong prime.

It is an emirp because it is prime and its reverse (72781231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13218727 - 2⁷ = 13218599 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13218827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6609363 + 6609364.

It is an arithmetic number, because the mean of its divisors is an integer number (6609364).

Almost surely, 2^13218727 is an apocalyptic number.

13218727 is a deficient number, since it is larger than the sum of its proper divisors (1).

13218727 is an equidigital number, since it uses as much as digits as its factorization.

13218727 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4704, while the sum is 31.

The square root of 13218727 is about 3635.7567300357. The cubic root of 13218727 is about 236.4448601836. Note that the first 3 decimals are identical.

Adding to 13218727 its reverse (72781231), we get a palindrome (85999958).

The spelling of 13218727 in words is "thirteen million, two hundred eighteen thousand, seven hundred twenty-seven".