1680220 has 12 divisors (see below), whose sum is σ = 3528504. Its totient is φ = 672080.

The previous prime is 1680191. The next prime is 1680247. The reversal of 1680220 is 220861.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 41986 + ... + 42025.

It is an arithmetic number, because the mean of its divisors is an integer number (294042).

2^1680220 is an apocalyptic number.

1680220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1680220 is an abundant number, since it is smaller than the sum of its proper divisors (1848284).

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

1680220 is a wasteful number, since it uses less digits than its factorization.

1680220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84020 (or 84018 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 1680220 is about 1296.2330037459. The cubic root of 1680220 is about 118.8836279670.

The spelling of 1680220 in words is "one million, six hundred eighty thousand, two hundred twenty".