1664044 has 6 divisors (see below), whose sum is σ = 2912084. Its totient is φ = 832020.

The previous prime is 1664021. The next prime is 1664053. The reversal of 1664044 is 4404661.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 208002 + ... + 208009.

2^1664044 is an apocalyptic number.

It is an amenable number.

1664044 is a deficient number, since it is larger than the sum of its proper divisors (1248040).

1664044 is a wasteful number, since it uses less digits than its factorization.

1664044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416015 (or 416013 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 1664044 is about 1289.9782943910. The cubic root of 1664044 is about 118.5008871969.

The spelling of 1664044 in words is "one million, six hundred sixty-four thousand, forty-four".