1680841 has 4 divisors (see below), whose sum is σ = 1779732. Its totient is φ = 1581952.

The previous prime is 1680839. The next prime is 1680859. The reversal of 1680841 is 1480861.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1345600 + 335241 = 1160^2 + 579^2 .

It is not a de Polignac number, because 1680841 - 2¹ = 1680839 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1680821) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 49420 + ... + 49453.

It is an arithmetic number, because the mean of its divisors is an integer number (444933).

2^1680841 is an apocalyptic number.

It is an amenable number.

1680841 is a deficient number, since it is larger than the sum of its proper divisors (98891).

1680841 is an equidigital number, since it uses as much as digits as its factorization.

1680841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98890.

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 1680841 is about 1296.4725218839. The cubic root of 1680841 is about 118.8982724063.

The spelling of 1680841 in words is "one million, six hundred eighty thousand, eight hundred forty-one".