1816444 has 24 divisors (see below), whose sum is σ = 3759840. Its totient is φ = 751296.

The previous prime is 1816439. The next prime is 1816453. The reversal of 1816444 is 4446181.

It is a Harshad number since it is a multiple of its sum of digits (28).

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, 307 + ... + 1930.

It is an arithmetic number, because the mean of its divisors is an integer number (156660).

2^1816444 is an apocalyptic number.

1816444 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1816444 is an abundant number, since it is smaller than the sum of its proper divisors (1943396).

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

1816444 is a wasteful number, since it uses less digits than its factorization.

1816444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2277 (or 2275 counting only the distinct ones).

The product of its digits is 3072, while the sum is 28.

The square root of 1816444 is about 1347.7551706449. The cubic root of 1816444 is about 122.0133462063.

The spelling of 1816444 in words is "one million, eight hundred sixteen thousand, four hundred forty-four".