1668695 has 20 divisors (see below), whose sum is σ = 2352840. Its totient is φ = 1136016.

The previous prime is 1668683. The next prime is 1668721. The reversal of 1668695 is 5968661.

It is not a de Polignac number, because 1668695 - 2⁴ = 1668679 is a prime.

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 19 ways as a sum of consecutive naturals, for example, 11936 + ... + 12074.

It is an arithmetic number, because the mean of its divisors is an integer number (117642).

2^1668695 is an apocalyptic number.

1668695 is a deficient number, since it is larger than the sum of its proper divisors (684145).

1668695 is an frugal number, since it uses more digits than its factorization.

1668695 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172 (or 151 counting only the distinct ones).

The product of its digits is 77760, while the sum is 41.

The square root of 1668695 is about 1291.7797799935. The cubic root of 1668695 is about 118.6111877531.

The spelling of 1668695 in words is "one million, six hundred sixty-eight thousand, six hundred ninety-five".