1681966 has 16 divisors (see below), whose sum is σ = 2964528. Its totient is φ = 705600.

The previous prime is 1681957. The next prime is 1681973. The reversal of 1681966 is 6691861.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2655 + ... + 3226.

It is an arithmetic number, because the mean of its divisors is an integer number (185283).

2^1681966 is an apocalyptic number.

1681966 is a deficient number, since it is larger than the sum of its proper divisors (1282562).

1681966 is a wasteful number, since it uses less digits than its factorization.

1681966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5907.

The product of its digits is 15552, while the sum is 37.

The square root of 1681966 is about 1296.9063188989. The cubic root of 1681966 is about 118.9247930043.

The spelling of 1681966 in words is "one million, six hundred eighty-one thousand, nine hundred sixty-six".