1987687 has 4 divisors (see below), whose sum is σ = 2140600. Its totient is φ = 1834776.

The previous prime is 1987681. The next prime is 1987693. The reversal of 1987687 is 7867891.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1987681) and next prime (1987693).

It is a cyclic number.

It is not a de Polignac number, because 1987687 - 2³ = 1987679 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1987681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76437 + ... + 76462.

It is an arithmetic number, because the mean of its divisors is an integer number (535150).

2^1987687 is an apocalyptic number.

1987687 is a deficient number, since it is larger than the sum of its proper divisors (152913).

1987687 is a wasteful number, since it uses less digits than its factorization.

1987687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152912.

The product of its digits is 169344, while the sum is 46.

The square root of 1987687 is about 1409.8535384926. The cubic root of 1987687 is about 125.7330157674.

The spelling of 1987687 in words is "one million, nine hundred eighty-seven thousand, six hundred eighty-seven".