1668589 has 8 divisors (see below), whose sum is σ = 1846040. Its totient is φ = 1498176.

The previous prime is 1668587. The next prime is 1668593. The reversal of 1668589 is 9858661.

It can be written as a sum of positive squares in 4 ways, for example, as 22500 + 1646089 = 150^2 + 1283^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1668589 - 2¹ = 1668587 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 (1668587) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1254 + ... + 2215.

It is an arithmetic number, because the mean of its divisors is an integer number (230755).

2^1668589 is an apocalyptic number.

It is an amenable number.

1668589 is a deficient number, since it is larger than the sum of its proper divisors (177451).

1668589 is a wasteful number, since it uses less digits than its factorization.

1668589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3519.

The product of its digits is 103680, while the sum is 43.

The square root of 1668589 is about 1291.7387506768. The cubic root of 1668589 is about 118.6086761993.

The spelling of 1668589 in words is "one million, six hundred sixty-eight thousand, five hundred eighty-nine".