1668986 has 16 divisors (see below), whose sum is σ = 2760480. Its totient is φ = 750480.

The previous prime is 1668983. The next prime is 1669027. The reversal of 1668986 is 6898661.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1668983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2000 + ... + 2708.

It is an arithmetic number, because the mean of its divisors is an integer number (172530).

2^1668986 is an apocalyptic number.

1668986 is a deficient number, since it is larger than the sum of its proper divisors (1091494).

1668986 is a wasteful number, since it uses less digits than its factorization.

1668986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 829.

The product of its digits is 124416, while the sum is 44.

The square root of 1668986 is about 1291.8924103810. The cubic root of 1668986 is about 118.6180821326.

The spelling of 1668986 in words is "one million, six hundred sixty-eight thousand, nine hundred eighty-six".