1808400 has 120 divisors (see below), whose sum is σ = 6365664. Its totient is φ = 435200.

The previous prime is 1808399. The next prime is 1808431. The reversal of 1808400 is 48081.

It is a tau number, because it is divible by the number of its divisors (120).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13132 + ... + 13268.

2^1808400 is an apocalyptic number.

1808400 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 1808400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3182832).

1808400 is an abundant number, since it is smaller than the sum of its proper divisors (4557264).

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

1808400 is a wasteful number, since it uses less digits than its factorization.

1808400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169 (or 158 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 21.

The square root of 1808400 is about 1344.7676379211. The cubic root of 1808400 is about 121.8329703858.

The spelling of 1808400 in words is "one million, eight hundred eight thousand, four hundred".