18900012 has 24 divisors (see below), whose sum is σ = 44933616. Its totient is φ = 6180928.

The previous prime is 18899999. The next prime is 18900053. The reversal of 18900012 is 21000981.

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, 14223 + ... + 15494.

It is an arithmetic number, because the mean of its divisors is an integer number (1872234).

Almost surely, 2^18900012 is an apocalyptic number.

18900012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18900012 is an abundant number, since it is smaller than the sum of its proper divisors (26033604).

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

18900012 is a wasteful number, since it uses less digits than its factorization.

18900012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29777 (or 29775 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 18900012 is about 4347.4144039877. The cubic root of 18900012 is about 266.3712568976.

Adding to 18900012 its reverse (21000981), we get a palindrome (39900993).

The spelling of 18900012 in words is "eighteen million, nine hundred thousand, twelve".