1686631936 has 40 divisors (see below), whose sum is σ = 3676342824. Its totient is φ = 766648320.

The previous prime is 1686631907. The next prime is 1686631949. The reversal of 1686631936 is 6391366861.

It is a self number, because there is not a number n which added to its sum of digits gives 1686631936.

It is a congruent number.

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 in 3 ways as a sum of consecutive naturals, for example, 144105 + ... + 155368.

Almost surely, 2^1686631936 is an apocalyptic number.

1686631936 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1686631936 is an abundant number, since it is smaller than the sum of its proper divisors (1989710888).

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

1686631936 is an equidigital number, since it uses as much as digits as its factorization.

1686631936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299502 (or 299486 counting only the distinct ones).

The product of its digits is 839808, while the sum is 49.

The square root of 1686631936 is about 41068.6247152251. The cubic root of 1686631936 is about 1190.3466108942.

The spelling of 1686631936 in words is "one billion, six hundred eighty-six million, six hundred thirty-one thousand, nine hundred thirty-six".