18123885 has 64 divisors (see below), whose sum is σ = 36288000. Its totient is φ = 8515584.

The previous prime is 18123881. The next prime is 18123901. The reversal of 18123885 is 58832181.

It is not a de Polignac number, because 18123885 - 2² = 18123881 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18123881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 40141 + ... + 40589.

It is an arithmetic number, because the mean of its divisors is an integer number (567000).

Almost surely, 2^18123885 is an apocalyptic number.

18123885 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18123885 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

18123885 is a wasteful number, since it uses less digits than its factorization.

18123885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 499 (or 493 counting only the distinct ones).

The product of its digits is 15360, while the sum is 36.

The square root of 18123885 is about 4257.2156393587. The cubic root of 18123885 is about 262.6740070770.

The spelling of 18123885 in words is "eighteen million, one hundred twenty-three thousand, eight hundred eighty-five".