1987115 has 16 divisors (see below), whose sum is σ = 2704800. Its totient is φ = 1389312.

The previous prime is 1987099. The next prime is 1987121. The reversal of 1987115 is 5117891.

It is a cyclic number.

It is not a de Polignac number, because 1987115 - 2⁴ = 1987099 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 431 + ... + 2039.

It is an arithmetic number, because the mean of its divisors is an integer number (169050).

2^1987115 is an apocalyptic number.

1987115 is a deficient number, since it is larger than the sum of its proper divisors (717685).

1987115 is a wasteful number, since it uses less digits than its factorization.

1987115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1646.

The product of its digits is 2520, while the sum is 32.

The square root of 1987115 is about 1409.6506659453. The cubic root of 1987115 is about 125.7209538105.

The spelling of 1987115 in words is "one million, nine hundred eighty-seven thousand, one hundred fifteen".