1005644 has 12 divisors (see below), whose sum is σ = 1785168. Its totient is φ = 495600.

The previous prime is 1005643. The next prime is 1005647. The reversal of 1005644 is 4465001.

It is a happy number.

1005644 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×1005644² = 2022639709472, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1005643) 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, 1487 + ... + 2054.

It is an arithmetic number, because the mean of its divisors is an integer number (148764).

2^1005644 is an apocalyptic number.

It is an amenable number.

1005644 is a deficient number, since it is larger than the sum of its proper divisors (779524).

1005644 is a wasteful number, since it uses less digits than its factorization.

1005644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3616 (or 3614 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 1005644 is about 1002.8180293553. The cubic root of 1005644 is about 100.1877804975.

The spelling of 1005644 in words is "one million, five thousand, six hundred forty-four".