1680516 has 18 divisors (see below), whose sum is σ = 4248062. Its totient is φ = 560160.

The previous prime is 1680509. The next prime is 1680527. The reversal of 1680516 is 6150861.

It can be written as a sum of positive squares in only one way, i.e., 1679616 + 900 = 1296^2 + 30^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a self number, because there is not a number n which added to its sum of digits gives 1680516.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 23305 + ... + 23376.

2^1680516 is an apocalyptic number.

It is an amenable number.

1680516 is an abundant number, since it is smaller than the sum of its proper divisors (2567546).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1680516 is a wasteful number, since it uses less digits than its factorization.

1680516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46691 (or 46686 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 1680516 is about 1296.3471757211. The cubic root of 1680516 is about 118.8906086972.

The spelling of 1680516 in words is "one million, six hundred eighty thousand, five hundred sixteen".