1680439 has 2 divisors, whose sum is σ = 1680440. Its totient is φ = 1680438.

The previous prime is 1680431. The next prime is 1680457. The reversal of 1680439 is 9340861.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1680439 - 2³ = 1680431 is a prime.

It is a super-3 number, since 3×1680439³ = 14236050216595333557, which contains 333 as substring.

It is a d-powerful number, because it can be written as 1 + 6⁸ + 8 + 0 + 4 + 3⁶ + 9² .

It is a self number, because there is not a number n which added to its sum of digits gives 1680439.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1680431) 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, 840219 + 840220.

It is an arithmetic number, because the mean of its divisors is an integer number (840220).

2^1680439 is an apocalyptic number.

1680439 is a deficient number, since it is larger than the sum of its proper divisors (1).

1680439 is an equidigital number, since it uses as much as digits as its factorization.

1680439 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 1680439 is about 1296.3174765465. The cubic root of 1680439 is about 118.8887928429. Note that the first 3 decimals are identical.

The spelling of 1680439 in words is "one million, six hundred eighty thousand, four hundred thirty-nine".