1680916 has 18 divisors (see below), whose sum is σ = 3026282. Its totient is φ = 816720.

The previous prime is 1680907. The next prime is 1680919. The reversal of 1680916 is 6190861.

1680916 = T₅₁ + T₅₂ + ... + T₂₁₆.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 992016 + 688900 = 996^2 + 830^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1680919) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 20211 + ... + 20293.

2^1680916 is an apocalyptic number.

It is an amenable number.

1680916 is a deficient number, since it is larger than the sum of its proper divisors (1345366).

1680916 is an equidigital number, since it uses as much as digits as its factorization.

1680916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231 (or 146 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 1680916 is about 1296.5014462005. The cubic root of 1680916 is about 118.9000408143.

The spelling of 1680916 in words is "one million, six hundred eighty thousand, nine hundred sixteen".