1687868 has 24 divisors (see below), whose sum is σ = 3636192. Its totient is φ = 667584.

The previous prime is 1687859. The next prime is 1687909. The reversal of 1687868 is 8687861.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1955 + ... + 2682.

It is an arithmetic number, because the mean of its divisors is an integer number (151508).

2^1687868 is an apocalyptic number.

It is an amenable number.

1687868 is an abundant number, since it is smaller than the sum of its proper divisors (1948324).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1687868 is a wasteful number, since it uses less digits than its factorization.

1687868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4661 (or 4659 counting only the distinct ones).

The product of its digits is 129024, while the sum is 44.

The square root of 1687868 is about 1299.1797412214. The cubic root of 1687868 is about 119.0637325440.

The spelling of 1687868 in words is "one million, six hundred eighty-seven thousand, eight hundred sixty-eight".