1680687 has 6 divisors (see below), whose sum is σ = 2427672. Its totient is φ = 1120452.

The previous prime is 1680659. The next prime is 1680689. The reversal of 1680687 is 7860861.

It is not a de Polignac number, because 1680687 - 2⁸ = 1680431 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1680689) 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, 93363 + ... + 93380.

It is an arithmetic number, because the mean of its divisors is an integer number (404612).

2^1680687 is an apocalyptic number.

1680687 is a deficient number, since it is larger than the sum of its proper divisors (746985).

1680687 is a wasteful number, since it uses less digits than its factorization.

1680687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186749 (or 186746 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 1680687 is about 1296.4131285975. The cubic root of 1680687 is about 118.8946411104.

The spelling of 1680687 in words is "one million, six hundred eighty thousand, six hundred eighty-seven".