18180200 has 24 divisors (see below), whose sum is σ = 42269430. Its totient is φ = 7272000.

The previous prime is 18180199. The next prime is 18180223. The reversal of 18180200 is 208181.

It can be written as a sum of positive squares in 3 ways, for example, as 9897316 + 8282884 = 3146^2 + 2878^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 45251 + ... + 45650.

Almost surely, 2^18180200 is an apocalyptic number.

18180200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18180200 is an abundant number, since it is smaller than the sum of its proper divisors (24089230).

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

18180200 is a wasteful number, since it uses less digits than its factorization.

18180200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90917 (or 90908 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

The square root of 18180200 is about 4263.8245742526. The cubic root of 18180200 is about 262.9457882450.

Adding to 18180200 its reverse (208181), we get a palindrome (18388381).

The spelling of 18180200 in words is "eighteen million, one hundred eighty thousand, two hundred".