1680239 has 8 divisors (see below), whose sum is σ = 1852032. Its totient is φ = 1511640.

The previous prime is 1680191. The next prime is 1680247. The reversal of 1680239 is 9320861.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1680239 is a prime.

It is a d-powerful number, because it can be written as 1 + 6⁸ + 8³ + 0 + 2 + 3³ + 9² .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1680269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 392 + ... + 1874.

It is an arithmetic number, because the mean of its divisors is an integer number (231504).

2^1680239 is an apocalyptic number.

1680239 is a deficient number, since it is larger than the sum of its proper divisors (171793).

1680239 is a wasteful number, since it uses less digits than its factorization.

1680239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1597.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 1680239 is about 1296.2403326544. The cubic root of 1680239 is about 118.8840760790.

The spelling of 1680239 in words is "one million, six hundred eighty thousand, two hundred thirty-nine".