1666868 has 24 divisors (see below), whose sum is σ = 3393600. Its totient is φ = 701568.

The previous prime is 1666853. The next prime is 1666871. The reversal of 1666868 is 8686661.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1148 + ... + 2156.

It is an arithmetic number, because the mean of its divisors is an integer number (141400).

2^1666868 is an apocalyptic number.

It is an amenable number.

1666868 is an abundant number, since it is smaller than the sum of its proper divisors (1726732).

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

1666868 is a wasteful number, since it uses less digits than its factorization.

1666868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1079 (or 1077 counting only the distinct ones).

The product of its digits is 82944, while the sum is 41.

The square root of 1666868 is about 1291.0724224458. The cubic root of 1666868 is about 118.5678840987.

The spelling of 1666868 in words is "one million, six hundred sixty-six thousand, eight hundred sixty-eight".