1680920 has 16 divisors (see below), whose sum is σ = 3782160. Its totient is φ = 672352.

The previous prime is 1680919. The next prime is 1680929. The reversal of 1680920 is 290861.

It is a self number, because there is not a number n which added to its sum of digits gives 1680920.

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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20972 + ... + 21051.

It is an arithmetic number, because the mean of its divisors is an integer number (236385).

2^1680920 is an apocalyptic number.

1680920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1680920 is an abundant number, since it is smaller than the sum of its proper divisors (2101240).

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

1680920 is a wasteful number, since it uses less digits than its factorization.

1680920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42034 (or 42030 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 1680920 is about 1296.5029888126. The cubic root of 1680920 is about 118.9001351279.

The spelling of 1680920 in words is "one million, six hundred eighty thousand, nine hundred twenty".