1668918 has 16 divisors (see below), whose sum is σ = 3351600. Its totient is φ = 554016.

The previous prime is 1668913. The next prime is 1668929. The reversal of 1668918 is 8198661.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668911) 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, 1696 + ... + 2492.

It is an arithmetic number, because the mean of its divisors is an integer number (209475).

2^1668918 is an apocalyptic number.

1668918 is an abundant number, since it is smaller than the sum of its proper divisors (1682682).

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

1668918 is a wasteful number, since it uses less digits than its factorization.

1668918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1151.

The product of its digits is 20736, while the sum is 39.

The square root of 1668918 is about 1291.8660921318. The cubic root of 1668918 is about 118.6164711466.

The spelling of 1668918 in words is "one million, six hundred sixty-eight thousand, nine hundred eighteen".