1688329 has 2 divisors, whose sum is σ = 1688330. Its totient is φ = 1688328.

The previous prime is 1688327. The next prime is 1688341. The reversal of 1688329 is 9238861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1630729 + 57600 = 1277^2 + 240^2 .

It is a cyclic number.

It is not a de Polignac number, because 1688329 - 2¹ = 1688327 is a prime.

Together with 1688327, it forms a pair of twin primes.

1688329 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1688327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 844164 + 844165.

It is an arithmetic number, because the mean of its divisors is an integer number (844165).

2^1688329 is an apocalyptic number.

It is an amenable number.

1688329 is a deficient number, since it is larger than the sum of its proper divisors (1).

1688329 is an equidigital number, since it uses as much as digits as its factorization.

1688329 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 37.

The square root of 1688329 is about 1299.3571487470. The cubic root of 1688329 is about 119.0745713426.

The spelling of 1688329 in words is "one million, six hundred eighty-eight thousand, three hundred twenty-nine".