1685683980 has 96 divisors (see below), whose sum is σ = 5259038400. Its totient is φ = 448257024.

The previous prime is 1685683903. The next prime is 1685684003. The reversal of 1685683980 is 893865861.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 197236 + ... + 205604.

It is an arithmetic number, because the mean of its divisors is an integer number (54781650).

Almost surely, 2^1685683980 is an apocalyptic number.

1685683980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1685683980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2629519200).

1685683980 is an abundant number, since it is smaller than the sum of its proper divisors (3573354420).

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

1685683980 is a wasteful number, since it uses less digits than its factorization.

1685683980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8760 (or 8752 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 54.

The square root of 1685683980 is about 41057.0819713238. The cubic root of 1685683980 is about 1190.1235613053.

The spelling of 1685683980 in words is "one billion, six hundred eighty-five million, six hundred eighty-three thousand, nine hundred eighty".