1668717 has 12 divisors (see below), whose sum is σ = 2441920. Its totient is φ = 1097928.

The previous prime is 1668683. The next prime is 1668721. The reversal of 1668717 is 7178661.

It is a happy number.

It is not a de Polignac number, because 1668717 - 2¹⁰ = 1667693 is a prime.

It is a Duffinian number.

1668717 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668727) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 463 + ... + 1884.

2^1668717 is an apocalyptic number.

It is an amenable number.

1668717 is a deficient number, since it is larger than the sum of its proper divisors (773203).

1668717 is a wasteful number, since it uses less digits than its factorization.

1668717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2432 (or 2429 counting only the distinct ones).

The product of its digits is 14112, while the sum is 36.

The square root of 1668717 is about 1291.7882953487. The cubic root of 1668717 is about 118.6117090057.

The spelling of 1668717 in words is "one million, six hundred sixty-eight thousand, seven hundred seventeen".