1680636 has 12 divisors (see below), whose sum is σ = 3921512. Its totient is φ = 560208.

The previous prime is 1680617. The next prime is 1680643. The reversal of 1680636 is 6360861.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70015 + ... + 70038.

2^1680636 is an apocalyptic number.

It is an amenable number.

1680636 is an abundant number, since it is smaller than the sum of its proper divisors (2240876).

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

1680636 is a wasteful number, since it uses less digits than its factorization.

1680636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140060 (or 140058 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 1680636 is about 1296.3934587925. The cubic root of 1680636 is about 118.8934384895.

The spelling of 1680636 in words is "one million, six hundred eighty thousand, six hundred thirty-six".