13218755 has 8 divisors (see below), whose sum is σ = 17304624. Its totient is φ = 9613600.

The previous prime is 13218743. The next prime is 13218823. The reversal of 13218755 is 55781231.

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

It is not a de Polignac number, because 13218755 - 2¹⁰ = 13217731 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 120116 + ... + 120225.

It is an arithmetic number, because the mean of its divisors is an integer number (2163078).

Almost surely, 2^13218755 is an apocalyptic number.

13218755 is a deficient number, since it is larger than the sum of its proper divisors (4085869).

13218755 is a wasteful number, since it uses less digits than its factorization.

13218755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240357.

The product of its digits is 8400, while the sum is 32.

The square root of 13218755 is about 3635.7605806763. The cubic root of 13218755 is about 236.4450271298.

Adding to 13218755 its reverse (55781231), we get a palindrome (68999986).

The spelling of 13218755 in words is "thirteen million, two hundred eighteen thousand, seven hundred fifty-five".