1668669 has 8 divisors (see below), whose sum is σ = 2355840. Its totient is φ = 1046976.

The previous prime is 1668649. The next prime is 1668679. The reversal of 1668669 is 9668661.

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

It is a de Polignac number, because none of the positive numbers 2^k-1668669 is a prime.

It is a super-2 number, since 2×1668669² = 5568912463122, which contains 22 as substring.

It is a Curzon number.

1668669 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1668669.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668619) 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 7 ways as a sum of consecutive naturals, for example, 16309 + ... + 16410.

It is an arithmetic number, because the mean of its divisors is an integer number (294480).

2^1668669 is an apocalyptic number.

It is an amenable number.

1668669 is a deficient number, since it is larger than the sum of its proper divisors (687171).

1668669 is a wasteful number, since it uses less digits than its factorization.

1668669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32739.

The product of its digits is 93312, while the sum is 42.

The square root of 1668669 is about 1291.7697163194. The cubic root of 1668669 is about 118.6105717215.

The spelling of 1668669 in words is "one million, six hundred sixty-eight thousand, six hundred sixty-nine".