18071218 has 16 divisors (see below), whose sum is σ = 30201984. Its totient is φ = 8038960.

The previous prime is 18071177. The next prime is 18071257. The reversal of 18071218 is 81217081.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7705 + ... + 9772.

It is an arithmetic number, because the mean of its divisors is an integer number (1887624).

Almost surely, 2^18071218 is an apocalyptic number.

18071218 is a deficient number, since it is larger than the sum of its proper divisors (12130766).

18071218 is a wasteful number, since it uses less digits than its factorization.

18071218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17537.

The product of its (nonzero) digits is 896, while the sum is 28.

The square root of 18071218 is about 4251.0255233296. The cubic root of 18071218 is about 262.4193215404.

Adding to 18071218 its reverse (81217081), we get a palindrome (99288299).

It can be divided in two parts, 1807 and 1218, that added together give a square (3025 = 55²).

The spelling of 18071218 in words is "eighteen million, seventy-one thousand, two hundred eighteen".