1800444 has 24 divisors (see below), whose sum is σ = 4273920. Its totient is φ = 589744.

The previous prime is 1800431. The next prime is 1800451. The reversal of 1800444 is 4440081.

It is a self number, because there is not a number n which added to its sum of digits gives 1800444.

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, 564 + ... + 1979.

It is an arithmetic number, because the mean of its divisors is an integer number (178080).

2^1800444 is an apocalyptic number.

It is an amenable number.

1800444 is an abundant number, since it is smaller than the sum of its proper divisors (2473476).

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

1800444 is a wasteful number, since it uses less digits than its factorization.

1800444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2609 (or 2607 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 21.

The square root of 1800444 is about 1341.8062453275. The cubic root of 1800444 is about 121.6540409325.

The spelling of 1800444 in words is "one million, eight hundred thousand, four hundred forty-four".