1686941764 has 12 divisors (see below), whose sum is σ = 2970952684. Its totient is φ = 838098144.

The previous prime is 1686941759. The next prime is 1686941797. The reversal of 1686941764 is 4671496861.

It can be written as a sum of positive squares in 2 ways, for example, as 272580100 + 1414361664 = 16510^2 + 37608^2 .

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 3 ways as a sum of consecutive naturals, for example, 1342479 + ... + 1343734.

Almost surely, 2^1686941764 is an apocalyptic number.

It is an amenable number.

1686941764 is a deficient number, since it is larger than the sum of its proper divisors (1284010920).

1686941764 is a wasteful number, since it uses less digits than its factorization.

1686941764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2686374 (or 2686372 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 52.

The square root of 1686941764 is about 41072.3966186538. The cubic root of 1686941764 is about 1190.4194938434.

The spelling of 1686941764 in words is "one billion, six hundred eighty-six million, nine hundred forty-one thousand, seven hundred sixty-four".