1866666 has 8 divisors (see below), whose sum is σ = 3733344. Its totient is φ = 622220.

The previous prime is 1866659. The next prime is 1866677. The reversal of 1866666 is 6666681.

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

1866666 is an admirable number.

1866666 is a modest number, since divided by 6666 gives 186 as remainder.

It is a Curzon 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 3 ways as a sum of consecutive naturals, for example, 155550 + ... + 155561.

It is an arithmetic number, because the mean of its divisors is an integer number (466668).

2^1866666 is an apocalyptic number.

1866666 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1866666 is a wasteful number, since it uses less digits than its factorization.

1866666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311116.

The product of its digits is 62208, while the sum is 39.

The square root of 1866666 is about 1366.2598581529. The cubic root of 1866666 is about 123.1276353718.

The spelling of 1866666 in words is "one million, eight hundred sixty-six thousand, six hundred sixty-six".