1680943 has 16 divisors (see below), whose sum is σ = 1982880. Its totient is φ = 1408000.

The previous prime is 1680929. The next prime is 1680961. The reversal of 1680943 is 3490861.

It is not a de Polignac number, because 1680943 - 2⁹ = 1680431 is a prime.

It is a d-powerful number, because it can be written as 1 + 6⁸ + 8³ + 0 + 9² + 4 + 3⁶ .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1680983) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16593 + ... + 16693.

It is an arithmetic number, because the mean of its divisors is an integer number (123930).

2^1680943 is an apocalyptic number.

1680943 is a deficient number, since it is larger than the sum of its proper divisors (301937).

1680943 is a wasteful number, since it uses less digits than its factorization.

1680943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 1680943 is about 1296.5118587965. The cubic root of 1680943 is about 118.9006774283.

The spelling of 1680943 in words is "one million, six hundred eighty thousand, nine hundred forty-three".