1805244 has 24 divisors (see below), whose sum is σ = 4814208. Its totient is φ = 515760.

The previous prime is 1805239. The next prime is 1805261. The reversal of 1805244 is 4425081.

1805244 = T₃₄₅ + T₃₄₆ + ... + T₃₇₂.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10662 + ... + 10829.

It is an arithmetic number, because the mean of its divisors is an integer number (200592).

2^1805244 is an apocalyptic number.

1805244 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1805244 is an abundant number, since it is smaller than the sum of its proper divisors (3008964).

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

1805244 is a wasteful number, since it uses less digits than its factorization.

1805244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21505 (or 21503 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 24.

The square root of 1805244 is about 1343.5936885830. The cubic root of 1805244 is about 121.7620552583.

The spelling of 1805244 in words is "one million, eight hundred five thousand, two hundred forty-four".