1685020 has 24 divisors (see below), whose sum is σ = 3566304. Its totient is φ = 668736.

The previous prime is 1685011. The next prime is 1685039. The reversal of 1685020 is 205861.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1684982 and 1685000.

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 7 ways as a sum of consecutive naturals, for example, 3217 + ... + 3703.

It is an arithmetic number, because the mean of its divisors is an integer number (148596).

2^1685020 is an apocalyptic number.

1685020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1685020 is an abundant number, since it is smaller than the sum of its proper divisors (1881284).

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

1685020 is a wasteful number, since it uses less digits than its factorization.

1685020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 669 (or 667 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 1685020 is about 1298.0832022640. The cubic root of 1685020 is about 118.9967280130.

The spelling of 1685020 in words is "one million, six hundred eighty-five thousand, twenty".