1680925 has 12 divisors (see below), whose sum is σ = 2115936. Its totient is φ = 1324400.

The previous prime is 1680919. The next prime is 1680929. The reversal of 1680925 is 5290861.

It is not a de Polignac number, because 1680925 - 2⁵ = 1680893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a 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 in 11 ways as a sum of consecutive naturals, for example, 1302 + ... + 2248.

It is an arithmetic number, because the mean of its divisors is an integer number (176328).

2^1680925 is an apocalyptic number.

It is an amenable number.

1680925 is a deficient number, since it is larger than the sum of its proper divisors (435011).

1680925 is an equidigital number, since it uses as much as digits as its factorization.

1680925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1028 (or 1023 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 1680925 is about 1296.5049170751. The cubic root of 1680925 is about 118.9002530197.

The spelling of 1680925 in words is "one million, six hundred eighty thousand, nine hundred twenty-five".