1687887 has 18 divisors (see below), whose sum is σ = 2536352. Its totient is φ = 1081584.

The previous prime is 1687859. The next prime is 1687909. The reversal of 1687887 is 7887861.

It is not a de Polignac number, because 1687887 - 2⁶ = 1687823 is a prime.

It is a d-powerful number, because it can be written as 1 + 6⁸ + 8² + 7 + 8⁴ + 8⁴ + 7 .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1687837) by changing a digit.

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 17 ways as a sum of consecutive naturals, for example, 7458 + ... + 7680.

2^1687887 is an apocalyptic number.

1687887 is a deficient number, since it is larger than the sum of its proper divisors (848465).

1687887 is a wasteful number, since it uses less digits than its factorization.

1687887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287 (or 255 counting only the distinct ones).

The product of its digits is 150528, while the sum is 45.

The square root of 1687887 is about 1299.1870535069. The cubic root of 1687887 is about 119.0641793013.

The spelling of 1687887 in words is "one million, six hundred eighty-seven thousand, eight hundred eighty-seven".