18231118 has 8 divisors (see below), whose sum is σ = 27810360. Its totient is φ = 8961000.

The previous prime is 18231113. The next prime is 18231119. The reversal of 18231118 is 81113281.

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

It is a junction number, because it is equal to n+sod(n) for n = 18231092 and 18231101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18231113) 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, 77133 + ... + 77368.

It is an arithmetic number, because the mean of its divisors is an integer number (3476295).

Almost surely, 2^18231118 is an apocalyptic number.

18231118 is a deficient number, since it is larger than the sum of its proper divisors (9579242).

18231118 is a wasteful number, since it uses less digits than its factorization.

18231118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154562.

The product of its digits is 384, while the sum is 25.

The square root of 18231118 is about 4269.7913297959. The cubic root of 18231118 is about 263.1910402896.

Adding to 18231118 its reverse (81113281), we get a palindrome (99344399).

It can be divided in two parts, 182311 and 18, that added together give a square (182329 = 427²).

The spelling of 18231118 in words is "eighteen million, two hundred thirty-one thousand, one hundred eighteen".