1805844 has 24 divisors (see below), whose sum is σ = 4284448. Its totient is φ = 591840.

The previous prime is 1805833. The next prime is 1805857. The reversal of 1805844 is 4485081.

It is a super-2 number, since 2×1805844² = 6522145104672, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 502 + ... + 1965.

2^1805844 is an apocalyptic number.

It is an amenable number.

1805844 is an abundant number, since it is smaller than the sum of its proper divisors (2478604).

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

1805844 is a wasteful number, since it uses less digits than its factorization.

1805844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2535 (or 2533 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 30.

The square root of 1805844 is about 1343.8169518204. The cubic root of 1805844 is about 121.7755435810.

The spelling of 1805844 in words is "one million, eight hundred five thousand, eight hundred forty-four".