18140218 has 8 divisors (see below), whose sum is σ = 27362880. Its totient is φ = 9019260.

The previous prime is 18140203. The next prime is 18140219. The reversal of 18140218 is 81204181.

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 = 18140192 and 18140201.

It is not an unprimeable number, because it can be changed into a prime (18140219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24978 + ... + 25693.

It is an arithmetic number, because the mean of its divisors is an integer number (3420360).

Almost surely, 2^18140218 is an apocalyptic number.

18140218 is a deficient number, since it is larger than the sum of its proper divisors (9222662).

18140218 is a wasteful number, since it uses less digits than its factorization.

18140218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50852.

The product of its (nonzero) digits is 512, while the sum is 25.

The square root of 18140218 is about 4259.1334799464. The cubic root of 18140218 is about 262.7528894731.

Adding to 18140218 its reverse (81204181), we get a palindrome (99344399).

The spelling of 18140218 in words is "eighteen million, one hundred forty thousand, two hundred eighteen".