1681868 has 6 divisors (see below), whose sum is σ = 2943276. Its totient is φ = 840932.

The previous prime is 1681853. The next prime is 1681871. The reversal of 1681868 is 8681861.

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, 210230 + ... + 210237.

It is an arithmetic number, because the mean of its divisors is an integer number (490546).

2^1681868 is an apocalyptic number.

It is an amenable number.

1681868 is a deficient number, since it is larger than the sum of its proper divisors (1261408).

1681868 is a wasteful number, since it uses less digits than its factorization.

1681868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420471 (or 420469 counting only the distinct ones).

The product of its digits is 18432, while the sum is 38.

The square root of 1681868 is about 1296.8685361285. The cubic root of 1681868 is about 118.9224832358.

The spelling of 1681868 in words is "one million, six hundred eighty-one thousand, eight hundred sixty-eight".