1005444 has 36 divisors (see below), whose sum is σ = 2773680. Its totient is φ = 304560.

The previous prime is 1005439. The next prime is 1005457. The reversal of 1005444 is 4445001.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 874 + ... + 1665.

2^1005444 is an apocalyptic number.

It is an amenable number.

1005444 is an abundant number, since it is smaller than the sum of its proper divisors (1768236).

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

1005444 is a wasteful number, since it uses less digits than its factorization.

1005444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2560 (or 2555 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 1005444 is about 1002.7183054079. The cubic root of 1005444 is about 100.1811383575.

The spelling of 1005444 in words is "one million, five thousand, four hundred forty-four".