18111638 has 8 divisors (see below), whose sum is σ = 27745632. Its totient is φ = 8863096.

The previous prime is 18111629. The next prime is 18111671. The reversal of 18111638 is 83611181.

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

It is a self number, because there is not a number n which added to its sum of digits gives 18111638.

It is a congruent number.

It is an unprimeable number.

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, 96245 + ... + 96432.

It is an arithmetic number, because the mean of its divisors is an integer number (3468204).

Almost surely, 2^18111638 is an apocalyptic number.

18111638 is a deficient number, since it is larger than the sum of its proper divisors (9633994).

18111638 is a wasteful number, since it uses less digits than its factorization.

18111638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192726.

The product of its digits is 1152, while the sum is 29.

The square root of 18111638 is about 4255.7770148352. Note that the first 3 decimals coincide. The cubic root of 18111638 is about 262.6148274650.

The spelling of 18111638 in words is "eighteen million, one hundred eleven thousand, six hundred thirty-eight".