18140236 has 12 divisors (see below), whose sum is σ = 31860360. Its totient is φ = 9037280.

The previous prime is 18140219. The next prime is 18140267. The reversal of 18140236 is 63204181.

It is a self number, because there is not a number n which added to its sum of digits gives 18140236.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6946 + ... + 9193.

It is an arithmetic number, because the mean of its divisors is an integer number (2655030).

Almost surely, 2^18140236 is an apocalyptic number.

It is an amenable number.

18140236 is a deficient number, since it is larger than the sum of its proper divisors (13720124).

18140236 is a wasteful number, since it uses less digits than its factorization.

18140236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16424 (or 16422 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 18140236 is about 4259.1355930517. The cubic root of 18140236 is about 262.7529763804.

The spelling of 18140236 in words is "eighteen million, one hundred forty thousand, two hundred thirty-six".