1803820 has 12 divisors (see below), whose sum is σ = 3788064. Its totient is φ = 721520.

The previous prime is 1803817. The next prime is 1803863. The reversal of 1803820 is 283081.

It is a junction number, because it is equal to n+sod(n) for n = 1803791 and 1803800.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45076 + ... + 45115.

It is an arithmetic number, because the mean of its divisors is an integer number (315672).

2^1803820 is an apocalyptic number.

1803820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1803820 is an abundant number, since it is smaller than the sum of its proper divisors (1984244).

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

1803820 is a wasteful number, since it uses less digits than its factorization.

1803820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90200 (or 90198 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 1803820 is about 1343.0636619312. The cubic root of 1803820 is about 121.7300310043.

The spelling of 1803820 in words is "one million, eight hundred three thousand, eight hundred twenty".