18136318 has 4 divisors (see below), whose sum is σ = 27204480. Its totient is φ = 9068158.

The previous prime is 18136277. The next prime is 18136319. The reversal of 18136318 is 81363181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81363181 = 43 ⋅1892167.

It is a self number, because there is not a number n which added to its sum of digits gives 18136318.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18136319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4534078 + ... + 4534081.

It is an arithmetic number, because the mean of its divisors is an integer number (6801120).

Almost surely, 2^18136318 is an apocalyptic number.

18136318 is a deficient number, since it is larger than the sum of its proper divisors (9068162).

18136318 is an equidigital number, since it uses as much as digits as its factorization.

18136318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9068161.

The product of its digits is 3456, while the sum is 31.

The square root of 18136318 is about 4258.6756157284. The cubic root of 18136318 is about 262.7340582089.

Adding to 18136318 its reverse (81363181), we get a palindrome (99499499).

The spelling of 18136318 in words is "eighteen million, one hundred thirty-six thousand, three hundred eighteen".