1803444 has 12 divisors (see below), whose sum is σ = 4208064. Its totient is φ = 601144.

The previous prime is 1803421. The next prime is 1803449. The reversal of 1803444 is 4443081.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×1803444² = 6504820522272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1803449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75132 + ... + 75155.

It is an arithmetic number, because the mean of its divisors is an integer number (350672).

2^1803444 is an apocalyptic number.

It is an amenable number.

1803444 is an abundant number, since it is smaller than the sum of its proper divisors (2404620).

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

1803444 is a wasteful number, since it uses less digits than its factorization.

1803444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150294 (or 150292 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 1803444 is about 1342.9236761633. The cubic root of 1803444 is about 121.7215723495.

The spelling of 1803444 in words is "one million, eight hundred three thousand, four hundred forty-four".