1680839 has 2 divisors, whose sum is σ = 1680840. Its totient is φ = 1680838.

The previous prime is 1680823. The next prime is 1680859. The reversal of 1680839 is 9380861.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1680839 - 2⁴ = 1680823 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1680799 and 1680808.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1680859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 840419 + 840420.

It is an arithmetic number, because the mean of its divisors is an integer number (840420).

2^1680839 is an apocalyptic number.

1680839 is a deficient number, since it is larger than the sum of its proper divisors (1).

1680839 is an equidigital number, since it uses as much as digits as its factorization.

1680839 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 1680839 is about 1296.4717505600. The cubic root of 1680839 is about 118.8982252480.

The spelling of 1680839 in words is "one million, six hundred eighty thousand, eight hundred thirty-nine".