1818200 has 24 divisors (see below), whose sum is σ = 4227780. Its totient is φ = 727200.

The previous prime is 1818199. The next prime is 1818209. The reversal of 1818200 is 28181.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1818209) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 4346 + ... + 4745.

2^1818200 is an apocalyptic number.

1818200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1818200 is an abundant number, since it is smaller than the sum of its proper divisors (2409580).

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

1818200 is a wasteful number, since it uses less digits than its factorization.

1818200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9107 (or 9098 counting only the distinct ones).

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

The square root of 1818200 is about 1348.4064669083. The cubic root of 1818200 is about 122.0526512865.

The spelling of 1818200 in words is "one million, eight hundred eighteen thousand, two hundred".