1683866 has 4 divisors (see below), whose sum is σ = 2525802. Its totient is φ = 841932.

The previous prime is 1683841. The next prime is 1683887. The reversal of 1683866 is 6683861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6683861 = 41 ⋅163021.

It can be written as a sum of positive squares in only one way, i.e., 1288225 + 395641 = 1135^2 + 629^2 .

It is a Curzon 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 as a sum of consecutive naturals, namely, 420965 + ... + 420968.

2^1683866 is an apocalyptic number.

1683866 is a deficient number, since it is larger than the sum of its proper divisors (841936).

1683866 is an equidigital number, since it uses as much as digits as its factorization.

1683866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 841935.

The product of its digits is 41472, while the sum is 38.

The square root of 1683866 is about 1297.6386245793. The cubic root of 1683866 is about 118.9695565087.

The spelling of 1683866 in words is "one million, six hundred eighty-three thousand, eight hundred sixty-six".