13218377 has 4 divisors (see below), whose sum is σ = 13287060. Its totient is φ = 13149696.

The previous prime is 13218371. The next prime is 13218379. The reversal of 13218377 is 77381231.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5271616 + 7946761 = 2296^2 + 2819^2 .

It is a cyclic number.

It is not a de Polignac number, because 13218377 - 2⁶ = 13218313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13218371) 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 in 3 ways as a sum of consecutive naturals, for example, 34052 + ... + 34437.

It is an arithmetic number, because the mean of its divisors is an integer number (3321765).

Almost surely, 2^13218377 is an apocalyptic number.

It is an amenable number.

13218377 is a deficient number, since it is larger than the sum of its proper divisors (68683).

13218377 is an equidigital number, since it uses as much as digits as its factorization.

13218377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68682.

The product of its digits is 7056, while the sum is 32.

The square root of 13218377 is about 3635.7085966837. The cubic root of 13218377 is about 236.4427733353.

The spelling of 13218377 in words is "thirteen million, two hundred eighteen thousand, three hundred seventy-seven".