13218506 has 8 divisors (see below), whose sum is σ = 22660320. Its totient is φ = 5665068.

The previous prime is 13218487. The next prime is 13218511. The reversal of 13218506 is 60581231.

13218506 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 472076 + ... + 472103.

It is an arithmetic number, because the mean of its divisors is an integer number (2832540).

Almost surely, 2^13218506 is an apocalyptic number.

13218506 is a deficient number, since it is larger than the sum of its proper divisors (9441814).

13218506 is an equidigital number, since it uses as much as digits as its factorization.

13218506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 944188.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 13218506 is about 3635.7263373362. The cubic root of 13218506 is about 236.4435424922.

Adding to 13218506 its reverse (60581231), we get a palindrome (73799737).

The spelling of 13218506 in words is "thirteen million, two hundred eighteen thousand, five hundred six".