18872136 has 64 divisors (see below), whose sum is σ = 53726400. Its totient is φ = 6134400.

The previous prime is 18872123. The next prime is 18872143. The reversal of 18872136 is 63127881.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 18872136.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7791 + ... + 9921.

It is an arithmetic number, because the mean of its divisors is an integer number (839475).

Almost surely, 2^18872136 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18872136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26863200).

18872136 is an abundant number, since it is smaller than the sum of its proper divisors (34854264).

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

18872136 is a wasteful number, since it uses less digits than its factorization.

18872136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2187 (or 2177 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 18872136 is about 4344.2071773800. The cubic root of 18872136 is about 266.2402337223.

The spelling of 18872136 in words is "eighteen million, eight hundred seventy-two thousand, one hundred thirty-six".