1808900 has 18 divisors (see below), whose sum is σ = 3925530. Its totient is φ = 723520.

The previous prime is 1808887. The next prime is 1808921. The reversal of 1808900 is 98081.

It can be written as a sum of positive squares in 3 ways, for example, as 407044 + 1401856 = 638^2 + 1184^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1808900.

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, 8945 + ... + 9144.

It is an arithmetic number, because the mean of its divisors is an integer number (218085).

2^1808900 is an apocalyptic number.

1808900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1808900 is an abundant number, since it is smaller than the sum of its proper divisors (2116630).

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

1808900 is a wasteful number, since it uses less digits than its factorization.

1808900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18103 (or 18096 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 26.

The square root of 1808900 is about 1344.9535307958. The cubic root of 1808900 is about 121.8441977823.

The spelling of 1808900 in words is "one million, eight hundred eight thousand, nine hundred".