1680043 has 4 divisors (see below), whose sum is σ = 1682640. Its totient is φ = 1677448.

The previous prime is 1680023. The next prime is 1680071. The reversal of 1680043 is 3400861.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 3400861 = 1279 ⋅2659.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1680043 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1679996 and 1680023.

It is not an unprimeable number, because it can be changed into a prime (1680013) 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, 546 + ... + 1912.

It is an arithmetic number, because the mean of its divisors is an integer number (420660).

2^1680043 is an apocalyptic number.

1680043 is a deficient number, since it is larger than the sum of its proper divisors (2597).

1680043 is a wasteful number, since it uses less digits than its factorization.

1680043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2596.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 1680043 is about 1296.1647271856. The cubic root of 1680043 is about 118.8794532873.

The spelling of 1680043 in words is "one million, six hundred eighty thousand, forty-three".