1680907 has 2 divisors, whose sum is σ = 1680908. Its totient is φ = 1680906.

The previous prime is 1680901. The next prime is 1680919. The reversal of 1680907 is 7090861.

It is a weak prime.

It is an emirp because it is prime and its reverse (7090861) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1680907 - 2⁷ = 1680779 is a prime.

It is a d-powerful number, because it can be written as 1 + 6⁸ + 8³ + 0 + 9³ + 0 + 7² .

It is not a weakly prime, because it can be changed into another prime (1680901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 840453 + 840454.

It is an arithmetic number, because the mean of its divisors is an integer number (840454).

2^1680907 is an apocalyptic number.

1680907 is a deficient number, since it is larger than the sum of its proper divisors (1).

1680907 is an equidigital number, since it uses as much as digits as its factorization.

1680907 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 1680907 is about 1296.4979753166. The cubic root of 1680907 is about 118.8998286081.

The spelling of 1680907 in words is "one million, six hundred eighty thousand, nine hundred seven".