18180812 has 24 divisors (see below), whose sum is σ = 34546176. Its totient is φ = 8322048.

The previous prime is 18180809. The next prime is 18180817. The reversal of 18180812 is 21808181.

It is a plaindrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (18180817) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5228 + ... + 7980.

It is an arithmetic number, because the mean of its divisors is an integer number (1439424).

Almost surely, 2^18180812 is an apocalyptic number.

It is an amenable number.

18180812 is a deficient number, since it is larger than the sum of its proper divisors (16365364).

18180812 is a wasteful number, since it uses less digits than its factorization.

18180812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2897 (or 2895 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 29.

The square root of 18180812 is about 4263.8963402034. The cubic root of 18180812 is about 262.9487387262.

Adding to 18180812 its reverse (21808181), we get a palindrome (39988993).

The spelling of 18180812 in words is "eighteen million, one hundred eighty thousand, eight hundred twelve".