1686291916 has 6 divisors (see below), whose sum is σ = 2951010860. Its totient is φ = 843145956.

The previous prime is 1686291899. The next prime is 1686291947. The reversal of 1686291916 is 6191926861.

It is a self number, because there is not a number n which added to its sum of digits gives 1686291916.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210786486 + ... + 210786493.

Almost surely, 2^1686291916 is an apocalyptic number.

It is an amenable number.

1686291916 is a deficient number, since it is larger than the sum of its proper divisors (1264718944).

1686291916 is a wasteful number, since it uses less digits than its factorization.

1686291916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421572983 (or 421572981 counting only the distinct ones).

The product of its digits is 279936, while the sum is 49.

The square root of 1686291916 is about 41064.4848500502. The cubic root of 1686291916 is about 1190.2666154019.

The spelling of 1686291916 in words is "one billion, six hundred eighty-six million, two hundred ninety-one thousand, nine hundred sixteen".