18140188 has 12 divisors (see below), whose sum is σ = 34631352. Its totient is φ = 8245520.

The previous prime is 18140179. The next prime is 18140189. The reversal of 18140188 is 88104181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18140189) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 206095 + ... + 206182.

It is an arithmetic number, because the mean of its divisors is an integer number (2885946).

Almost surely, 2^18140188 is an apocalyptic number.

It is an amenable number.

18140188 is a deficient number, since it is larger than the sum of its proper divisors (16491164).

18140188 is a wasteful number, since it uses less digits than its factorization.

18140188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412292 (or 412290 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 31.

The square root of 18140188 is about 4259.1299581018. The cubic root of 18140188 is about 262.7527446275.

The spelling of 18140188 in words is "eighteen million, one hundred forty thousand, one hundred eighty-eight".