1686338988 has 12 divisors (see below), whose sum is σ = 3934791000. Its totient is φ = 562112992.

The previous prime is 1686338947. The next prime is 1686338993. The reversal of 1686338988 is 8898336861.

1686338988 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70264113 + ... + 70264136.

It is an arithmetic number, because the mean of its divisors is an integer number (327899250).

Almost surely, 2^1686338988 is an apocalyptic number.

It is an amenable number.

1686338988 is an abundant number, since it is smaller than the sum of its proper divisors (2248452012).

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

1686338988 is a wasteful number, since it uses less digits than its factorization.

1686338988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140528256 (or 140528254 counting only the distinct ones).

The product of its digits is 11943936, while the sum is 60.

The square root of 1686338988 is about 41065.0579933841. The cubic root of 1686338988 is about 1190.2776905324.

The spelling of 1686338988 in words is "one billion, six hundred eighty-six million, three hundred thirty-eight thousand, nine hundred eighty-eight".