1688339 has 4 divisors (see below), whose sum is σ = 1729560. Its totient is φ = 1647120.

The previous prime is 1688329. The next prime is 1688341. The reversal of 1688339 is 9338861.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1688339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1688329) 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, 20549 + ... + 20630.

It is an arithmetic number, because the mean of its divisors is an integer number (432390).

2^1688339 is an apocalyptic number.

1688339 is a deficient number, since it is larger than the sum of its proper divisors (41221).

1688339 is an equidigital number, since it uses as much as digits as its factorization.

1688339 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41220.

The product of its digits is 31104, while the sum is 38.

The square root of 1688339 is about 1299.3609967980. The cubic root of 1688339 is about 119.0748064357.

The spelling of 1688339 in words is "one million, six hundred eighty-eight thousand, three hundred thirty-nine".