18218207 has 8 divisors (see below), whose sum is σ = 21916800. Its totient is φ = 14793624.

The previous prime is 18218191. The next prime is 18218209. The reversal of 18218207 is 70281281.

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

It is a cyclic number.

It is not a de Polignac number, because 18218207 - 2⁴ = 18218191 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18218207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18218209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68357 + ... + 68622.

It is an arithmetic number, because the mean of its divisors is an integer number (2739600).

Almost surely, 2^18218207 is an apocalyptic number.

18218207 is a deficient number, since it is larger than the sum of its proper divisors (3698593).

18218207 is a wasteful number, since it uses less digits than its factorization.

18218207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137005.

The product of its (nonzero) digits is 1792, while the sum is 29.

The square root of 18218207 is about 4268.2791614420. The cubic root of 18218207 is about 263.1288963226.

Adding to 18218207 its reverse (70281281), we get a palindrome (88499488).

The spelling of 18218207 in words is "eighteen million, two hundred eighteen thousand, two hundred seven".