1680885 has 16 divisors (see below), whose sum is σ = 2988480. Its totient is φ = 896400.

The previous prime is 1680881. The next prime is 1680893. The reversal of 1680885 is 5880861.

It is not a de Polignac number, because 1680885 - 2² = 1680881 is a prime.

It is a congruent 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 15 ways as a sum of consecutive naturals, for example, 6091 + ... + 6360.

It is an arithmetic number, because the mean of its divisors is an integer number (186780).

2^1680885 is an apocalyptic number.

1680885 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1680885 is a deficient number, since it is larger than the sum of its proper divisors (1307595).

1680885 is a wasteful number, since it uses less digits than its factorization.

1680885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12465 (or 12459 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 36.

The square root of 1680885 is about 1296.4894908945. The cubic root of 1680885 is about 118.8993098787.

The spelling of 1680885 in words is "one million, six hundred eighty thousand, eight hundred eighty-five".