1987694512 has 40 divisors (see below), whose sum is σ = 3899163632. Its totient is φ = 981504000.

The previous prime is 1987694509. The next prime is 1987694543. The reversal of 1987694512 is 2154967891.

It is a self number, because there is not a number n which added to its sum of digits gives 1987694512.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 931687 + ... + 933817.

Almost surely, 2^1987694512 is an apocalyptic number.

It is an amenable number.

1987694512 is a deficient number, since it is larger than the sum of its proper divisors (1911469120).

1987694512 is a wasteful number, since it uses less digits than its factorization.

1987694512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2837 (or 2831 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 52.

The square root of 1987694512 is about 44583.5677352093. The cubic root of 1987694512 is about 1257.3317416012.

The spelling of 1987694512 in words is "one billion, nine hundred eighty-seven million, six hundred ninety-four thousand, five hundred twelve".