1681885 has 8 divisors (see below), whose sum is σ = 2027520. Its totient is φ = 1339344.

The previous prime is 1681879. The next prime is 1681891. The reversal of 1681885 is 5881861.

It is an interprime number because it is at equal distance from previous prime (1681879) and next prime (1681891).

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

It is a cyclic number.

It is not a de Polignac number, because 1681885 - 2³ = 1681877 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 676 + ... + 1954.

It is an arithmetic number, because the mean of its divisors is an integer number (253440).

2^1681885 is an apocalyptic number.

It is an amenable number.

1681885 is a deficient number, since it is larger than the sum of its proper divisors (345635).

1681885 is a wasteful number, since it uses less digits than its factorization.

1681885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1547.

The product of its digits is 15360, while the sum is 37.

The square root of 1681885 is about 1296.8750903614. The cubic root of 1681885 is about 118.9228839164.

The spelling of 1681885 in words is "one million, six hundred eighty-one thousand, eight hundred eighty-five".