1646866 has 16 divisors (see below), whose sum is σ = 2691864. Its totient is φ = 751104.

The previous prime is 1646861. The next prime is 1646893. The reversal of 1646866 is 6686461.

It can be written as a sum of positive squares in 4 ways, for example, as 874225 + 772641 = 935^2 + 879^2 .

It is not an unprimeable number, because it can be changed into a prime (1646861) 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 7 ways as a sum of consecutive naturals, for example, 2196 + ... + 2848.

2^1646866 is an apocalyptic number.

1646866 is a deficient number, since it is larger than the sum of its proper divisors (1044998).

1646866 is a wasteful number, since it uses less digits than its factorization.

1646866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 765.

The product of its digits is 41472, while the sum is 37.

The square root of 1646866 is about 1283.3027701988. The cubic root of 1646866 is about 118.0917126702.

The spelling of 1646866 in words is "one million, six hundred forty-six thousand, eight hundred sixty-six".