1688135 has 4 divisors (see below), whose sum is σ = 2025768. Its totient is φ = 1350504.

The previous prime is 1688123. The next prime is 1688143. The reversal of 1688135 is 5318861.

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

It is a cyclic number.

It is not a de Polignac number, because 1688135 - 2¹⁰ = 1687111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 168809 + ... + 168818.

It is an arithmetic number, because the mean of its divisors is an integer number (506442).

2^1688135 is an apocalyptic number.

1688135 is a deficient number, since it is larger than the sum of its proper divisors (337633).

1688135 is an equidigital number, since it uses as much as digits as its factorization.

1688135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337632.

The product of its digits is 5760, while the sum is 32.

The square root of 1688135 is about 1299.2824943021. The cubic root of 1688135 is about 119.0700103533.

The spelling of 1688135 in words is "one million, six hundred eighty-eight thousand, one hundred thirty-five".