1646666 has 8 divisors (see below), whose sum is σ = 2822880. Its totient is φ = 705708.

The previous prime is 1646647. The next prime is 1646669. The reversal of 1646666 is 6666461.

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

1646666 is a modest number, since divided by 6666 gives 164 as remainder.

It is not an unprimeable number, because it can be changed into a prime (1646669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58796 + ... + 58823.

It is an arithmetic number, because the mean of its divisors is an integer number (352860).

2^1646666 is an apocalyptic number.

1646666 is a deficient number, since it is larger than the sum of its proper divisors (1176214).

1646666 is a wasteful number, since it uses less digits than its factorization.

1646666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117628.

The product of its digits is 31104, while the sum is 35.

The square root of 1646666 is about 1283.2248438992. The cubic root of 1646666 is about 118.0869320143.

The spelling of 1646666 in words is "one million, six hundred forty-six thousand, six hundred sixty-six".