18180512 has 24 divisors (see below), whose sum is σ = 40906656. Its totient is φ = 7791552.

The previous prime is 18180509. The next prime is 18180523. The reversal of 18180512 is 21508181.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40358 + ... + 40805.

It is an arithmetic number, because the mean of its divisors is an integer number (1704444).

Almost surely, 2^18180512 is an apocalyptic number.

It is an amenable number.

18180512 is an abundant number, since it is smaller than the sum of its proper divisors (22726144).

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

18180512 is an equidigital number, since it uses as much as digits as its factorization.

18180512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81180 (or 81172 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 26.

The square root of 18180512 is about 4263.8611609667. The cubic root of 18180512 is about 262.9472924202.

Adding to 18180512 its reverse (21508181), we get a palindrome (39688693).

The spelling of 18180512 in words is "eighteen million, one hundred eighty thousand, five hundred twelve".