1680906 has 16 divisors (see below), whose sum is σ = 3374784. Its totient is φ = 558144.

The previous prime is 1680901. The next prime is 1680907. The reversal of 1680906 is 6090861.

It is not an unprimeable number, because it can be changed into a prime (1680901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2275 + ... + 2921.

It is an arithmetic number, because the mean of its divisors is an integer number (210924).

2^1680906 is an apocalyptic number.

1680906 is an abundant number, since it is smaller than the sum of its proper divisors (1693878).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1680906 is a wasteful number, since it uses less digits than its factorization.

1680906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1085.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 1680906 is about 1296.4975896622. The cubic root of 1680906 is about 118.8998050296.

The spelling of 1680906 in words is "one million, six hundred eighty thousand, nine hundred six".