18181214 has 8 divisors (see below), whose sum is σ = 28707240. Its totient is φ = 8612136.

The previous prime is 18181213. The next prime is 18181243. The reversal of 18181214 is 41218181.

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

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18181213) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 239189 + ... + 239264.

It is an arithmetic number, because the mean of its divisors is an integer number (3588405).

Almost surely, 2^18181214 is an apocalyptic number.

18181214 is a deficient number, since it is larger than the sum of its proper divisors (10526026).

18181214 is a wasteful number, since it uses less digits than its factorization.

18181214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 478474.

The product of its digits is 512, while the sum is 26.

The square root of 18181214 is about 4263.9434799256. The cubic root of 18181214 is about 262.9506767514.

Adding to 18181214 its reverse (41218181), we get a palindrome (59399395).

The spelling of 18181214 in words is "eighteen million, one hundred eighty-one thousand, two hundred fourteen".