1987887 has 16 divisors (see below), whose sum is σ = 2943360. Its totient is φ = 1183200.

The previous prime is 1987883. The next prime is 1987889. The reversal of 1987887 is 7887891.

It is not a de Polignac number, because 1987887 - 2² = 1987883 is a prime.

1987887 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1987883) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1437 + ... + 2457.

It is an arithmetic number, because the mean of its divisors is an integer number (183960).

2^1987887 is an apocalyptic number.

1987887 is a deficient number, since it is larger than the sum of its proper divisors (955473).

1987887 is a wasteful number, since it uses less digits than its factorization.

1987887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1094.

The product of its digits is 225792, while the sum is 48.

The square root of 1987887 is about 1409.9244660619. The cubic root of 1987887 is about 125.7372326889.

The spelling of 1987887 in words is "one million, nine hundred eighty-seven thousand, eight hundred eighty-seven".