18512200 has 72 divisors (see below), whose sum is σ = 50094450. Its totient is φ = 6343680.

The previous prime is 18512161. The next prime is 18512203. The reversal of 18512200 is 221581.

It can be written as a sum of positive squares in 3 ways, for example, as 13557124 + 4955076 = 3682^2 + 2226^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18512203) 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 17 ways as a sum of consecutive naturals, for example, 8856 + ... + 10744.

Almost surely, 2^18512200 is an apocalyptic number.

18512200 is a gapful number since it is divisible by the number (10) 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 18512200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25047225).

18512200 is an abundant number, since it is smaller than the sum of its proper divisors (31582250).

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

18512200 is a wasteful number, since it uses less digits than its factorization.

18512200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1919 (or 1903 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 18512200 is about 4302.5806209762. The cubic root of 18512200 is about 264.5367485030.

Adding to 18512200 its reverse (221581), we get a palindrome (18733781).

The spelling of 18512200 in words is "eighteen million, five hundred twelve thousand, two hundred".