1681986684 has 24 divisors (see below), whose sum is σ = 4485298048. Its totient is φ = 480567600.

The previous prime is 1681986679. The next prime is 1681986707. The reversal of 1681986684 is 4866891861.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10011742 + ... + 10011909.

Almost surely, 2^1681986684 is an apocalyptic number.

1681986684 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1681986684 is an abundant number, since it is smaller than the sum of its proper divisors (2803311364).

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

1681986684 is a wasteful number, since it uses less digits than its factorization.

1681986684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20023665 (or 20023663 counting only the distinct ones).

The product of its digits is 3981312, while the sum is 57.

The square root of 1681986684 is about 41012.0309665347. The cubic root of 1681986684 is about 1189.2528049537.

The spelling of 1681986684 in words is "one billion, six hundred eighty-one million, nine hundred eighty-six thousand, six hundred eighty-four".