18207418 has 8 divisors (see below), whose sum is σ = 28252980. Its totient is φ = 8789760.

The previous prime is 18207407. The next prime is 18207473. The reversal of 18207418 is 81470281.

It can be written as a sum of positive squares in 2 ways, for example, as 17867529 + 339889 = 4227^2 + 583^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 18207418.

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 3 ways as a sum of consecutive naturals, for example, 156903 + ... + 157018.

Almost surely, 2^18207418 is an apocalyptic number.

18207418 is a deficient number, since it is larger than the sum of its proper divisors (10045562).

18207418 is a wasteful number, since it uses less digits than its factorization.

18207418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313952.

The product of its (nonzero) digits is 3584, while the sum is 31.

The square root of 18207418 is about 4267.0151159798. The cubic root of 18207418 is about 263.0769435654.

Adding to 18207418 its reverse (81470281), we get a palindrome (99677699).

The spelling of 18207418 in words is "eighteen million, two hundred seven thousand, four hundred eighteen".