1680889 has 8 divisors (see below), whose sum is σ = 1939520. Its totient is φ = 1426896.

The previous prime is 1680881. The next prime is 1680893. The reversal of 1680889 is 9880861.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1680889 - 2³ = 1680881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1680881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 339 + ... + 1864.

It is an arithmetic number, because the mean of its divisors is an integer number (242440).

2^1680889 is an apocalyptic number.

It is an amenable number.

1680889 is a deficient number, since it is larger than the sum of its proper divisors (258631).

1680889 is a wasteful number, since it uses less digits than its factorization.

1680889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2319.

The product of its (nonzero) digits is 27648, while the sum is 40.

The square root of 1680889 is about 1296.4910335209. The cubic root of 1680889 is about 118.8994041935.

The spelling of 1680889 in words is "one million, six hundred eighty thousand, eight hundred eighty-nine".