18555012 has 72 divisors (see below), whose sum is σ = 55473600. Its totient is φ = 5116608.

The previous prime is 18555011. The next prime is 18555029. The reversal of 18555012 is 21055581.

It is not an unprimeable number, because it can be changed into a prime (18555011) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6039 + ... + 8577.

Almost surely, 2^18555012 is an apocalyptic number.

18555012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18555012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27736800).

18555012 is an abundant number, since it is smaller than the sum of its proper divisors (36918588).

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

18555012 is a wasteful number, since it uses less digits than its factorization.

18555012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2585 (or 2580 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 27.

The square root of 18555012 is about 4307.5529015904. The cubic root of 18555012 is about 264.7405173330.

The spelling of 18555012 in words is "eighteen million, five hundred fifty-five thousand, twelve".