1987685185 has 16 divisors (see below), whose sum is σ = 2490126336. Its totient is φ = 1520278848.

The previous prime is 1987685173. The next prime is 1987685213. The reversal of 1987685185 is 5815867891.

It is a cyclic number.

It is not a de Polignac number, because 1987685185 - 2⁵ = 1987685153 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 454027 + ... + 458383.

It is an arithmetic number, because the mean of its divisors is an integer number (155632896).

Almost surely, 2^1987685185 is an apocalyptic number.

It is an amenable number.

1987685185 is a deficient number, since it is larger than the sum of its proper divisors (502441151).

1987685185 is a wasteful number, since it uses less digits than its factorization.

1987685185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8352.

The product of its digits is 4838400, while the sum is 58.

The square root of 1987685185 is about 44583.4631337674. The cubic root of 1987685185 is about 1257.3297749758.

The spelling of 1987685185 in words is "one billion, nine hundred eighty-seven million, six hundred eighty-five thousand, one hundred eighty-five".