1680845 has 8 divisors (see below), whose sum is σ = 2033664. Its totient is φ = 1333584.

The previous prime is 1680839. The next prime is 1680859. The reversal of 1680845 is 5480861.

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 1680845 - 2⁸ = 1680589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 689 + ... + 1958.

It is an arithmetic number, because the mean of its divisors is an integer number (254208).

2^1680845 is an apocalyptic number.

It is an amenable number.

1680845 is a deficient number, since it is larger than the sum of its proper divisors (352819).

1680845 is a wasteful number, since it uses less digits than its factorization.

1680845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2779.

The product of its (nonzero) digits is 7680, while the sum is 32.

The square root of 1680845 is about 1296.4740645304. The cubic root of 1680845 is about 118.8983667227.

The spelling of 1680845 in words is "one million, six hundred eighty thousand, eight hundred forty-five".