18000012 has 24 divisors (see below), whose sum is σ = 42091056. Its totient is φ = 5987008.

The previous prime is 17999987. The next prime is 18000041. The reversal of 18000012 is 21000081.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (12).

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, 5338 + ... + 8030.

It is an arithmetic number, because the mean of its divisors is an integer number (1753794).

Almost surely, 2^18000012 is an apocalyptic number.

18000012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18000012 is an abundant number, since it is smaller than the sum of its proper divisors (24091044).

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

18000012 is a wasteful number, since it uses less digits than its factorization.

18000012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3257 (or 3255 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 18000012 is about 4242.6421013326. The cubic root of 18000012 is about 262.0741976596.

Adding to 18000012 its reverse (21000081), we get a palindrome (39000093).

The spelling of 18000012 in words is "eighteen million, twelve", and thus it is an aban number and an uban number.