1680697 has 2 divisors, whose sum is σ = 1680698. Its totient is φ = 1680696.

The previous prime is 1680689. The next prime is 1680703. The reversal of 1680697 is 7960861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1648656 + 32041 = 1284^2 + 179^2 .

It is a cyclic number.

It is not a de Polignac number, because 1680697 - 2³ = 1680689 is a prime.

It is a Chen prime.

It is a d-powerful number, because it can be written as 1 + 6³ + 8³ + 0 + 6⁸ + 9 + 7³ .

It is not a weakly prime, because it can be changed into another prime (1680617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 840348 + 840349.

It is an arithmetic number, because the mean of its divisors is an integer number (840349).

2^1680697 is an apocalyptic number.

It is an amenable number.

1680697 is a deficient number, since it is larger than the sum of its proper divisors (1).

1680697 is an equidigital number, since it uses as much as digits as its factorization.

1680697 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 1680697 is about 1296.4169853870. The cubic root of 1680697 is about 118.8948769156.

The spelling of 1680697 in words is "one million, six hundred eighty thousand, six hundred ninety-seven".