1680919 has 2 divisors, whose sum is σ = 1680920. Its totient is φ = 1680918.

The previous prime is 1680907. The next prime is 1680929. The reversal of 1680919 is 9190861.

It is a strong prime.

It is an emirp because it is prime and its reverse (9190861) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1680919 - 2⁹ = 1680407 is a prime.

It is a super-2 number, since 2×1680919² = 5650977369122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1680929) 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, 840459 + 840460.

It is an arithmetic number, because the mean of its divisors is an integer number (840460).

2^1680919 is an apocalyptic number.

1680919 is a deficient number, since it is larger than the sum of its proper divisors (1).

1680919 is an equidigital number, since it uses as much as digits as its factorization.

1680919 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 34.

The square root of 1680919 is about 1296.5026031597. The cubic root of 1680919 is about 118.9001115495.

It can be divided in two parts, 168091 and 9, that added together give a square (168100 = 410²).

The spelling of 1680919 in words is "one million, six hundred eighty thousand, nine hundred nineteen".