1668766 has 8 divisors (see below), whose sum is σ = 2730744. Its totient is φ = 758520.

The previous prime is 1668757. The next prime is 1668773. The reversal of 1668766 is 6678661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37905 + ... + 37948.

It is an arithmetic number, because the mean of its divisors is an integer number (341343).

2^1668766 is an apocalyptic number.

1668766 is the 691-st centered heptagonal number.

1668766 is a deficient number, since it is larger than the sum of its proper divisors (1061978).

1668766 is a wasteful number, since it uses less digits than its factorization.

1668766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75866.

The product of its digits is 72576, while the sum is 40.

The square root of 1668766 is about 1291.8072611655. The cubic root of 1668766 is about 118.6128699609.

The spelling of 1668766 in words is "one million, six hundred sixty-eight thousand, seven hundred sixty-six".