18111712 has 24 divisors (see below), whose sum is σ = 37535400. Its totient is φ = 8578944.

The previous prime is 18111701. The next prime is 18111713. The reversal of 18111712 is 21711181.

It is a super-2 number, since 2×18111712² = 656068223141888, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18111713) 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, 14287 + ... + 15502.

It is an arithmetic number, because the mean of its divisors is an integer number (1563975).

Almost surely, 2^18111712 is an apocalyptic number.

It is an amenable number.

18111712 is an abundant number, since it is smaller than the sum of its proper divisors (19423688).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18111712 is a wasteful number, since it uses less digits than its factorization.

18111712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29818 (or 29810 counting only the distinct ones).

The product of its digits is 112, while the sum is 22.

The square root of 18111712 is about 4255.7857088909. The cubic root of 18111712 is about 262.6151851258.

Adding to 18111712 its reverse (21711181), we get a palindrome (39822893).

The spelling of 18111712 in words is "eighteen million, one hundred eleven thousand, seven hundred twelve".