18136812 has 24 divisors (see below), whose sum is σ = 43119216. Its totient is φ = 5931328.

The previous prime is 18136799. The next prime is 18136823. The reversal of 18136812 is 21863181.

It is a self number, because there is not a number n which added to its sum of digits gives 18136812.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13623 + ... + 14894.

It is an arithmetic number, because the mean of its divisors is an integer number (1796634).

Almost surely, 2^18136812 is an apocalyptic number.

18136812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18136812 is an abundant number, since it is smaller than the sum of its proper divisors (24982404).

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

18136812 is a wasteful number, since it uses less digits than its factorization.

18136812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28577 (or 28575 counting only the distinct ones).

The product of its digits is 2304, while the sum is 30.

The square root of 18136812 is about 4258.7336145854. The cubic root of 18136812 is about 262.7364436517.

Adding to 18136812 its reverse (21863181), we get a palindrome (39999993).

The spelling of 18136812 in words is "eighteen million, one hundred thirty-six thousand, eight hundred twelve".