1666668 has 12 divisors (see below), whose sum is σ = 3888920. Its totient is φ = 555552.

The previous prime is 1666657. The next prime is 1666711. The reversal of 1666668 is 8666661.

1666668 is nontrivially palindromic in base 9.

It is a tau number, because it is divible by the number of its divisors (12).

It is a plaindrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69433 + ... + 69456.

2^1666668 is an apocalyptic number.

It is an amenable number.

1666668 is an abundant number, since it is smaller than the sum of its proper divisors (2222252).

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

1666668 is a wasteful number, since it uses less digits than its factorization.

1666668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138896 (or 138894 counting only the distinct ones).

The product of its digits is 62208, while the sum is 39.

The square root of 1666668 is about 1290.9949651335. The cubic root of 1666668 is about 118.5631417665.

The spelling of 1666668 in words is "one million, six hundred sixty-six thousand, six hundred sixty-eight".