18855312 has 80 divisors (see below), whose sum is σ = 58960512. Its totient is φ = 5068800.

The previous prime is 18855299. The next prime is 18855337. The reversal of 18855312 is 21355881.

It is a happy number.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4062 + ... + 7362.

Almost surely, 2^18855312 is an apocalyptic number.

18855312 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 18855312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29480256).

18855312 is an abundant number, since it is smaller than the sum of its proper divisors (40105200).

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

18855312 is a wasteful number, since it uses less digits than its factorization.

18855312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3336 (or 3330 counting only the distinct ones).

The product of its digits is 9600, while the sum is 33.

The square root of 18855312 is about 4342.2703738943. The cubic root of 18855312 is about 266.1610948729.

The spelling of 18855312 in words is "eighteen million, eight hundred fifty-five thousand, three hundred twelve".