1666648 has 16 divisors (see below), whose sum is σ = 3144960. Its totient is φ = 828000.

The previous prime is 1666627. The next prime is 1666657. The reversal of 1666648 is 8466661.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 873 + ... + 2023.

It is an arithmetic number, because the mean of its divisors is an integer number (196560).

2^1666648 is an apocalyptic number.

It is an amenable number.

1666648 is a deficient number, since it is larger than the sum of its proper divisors (1478312).

1666648 is a wasteful number, since it uses less digits than its factorization.

1666648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1338 (or 1334 counting only the distinct ones).

The product of its digits is 41472, while the sum is 37.

The square root of 1666648 is about 1290.9872191466. The cubic root of 1666648 is about 118.5626675124.

The spelling of 1666648 in words is "one million, six hundred sixty-six thousand, six hundred forty-eight".