1668586 has 8 divisors (see below), whose sum is σ = 2508804. Its totient is φ = 832320.

The previous prime is 1668553. The next prime is 1668587. The reversal of 1668586 is 6858661.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1221025 + 447561 = 1105^2 + 669^2 .

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

It is not an unprimeable number, because it can be changed into a prime (1668587) 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 3 ways as a sum of consecutive naturals, for example, 546 + ... + 1906.

2^1668586 is an apocalyptic number.

1668586 is a deficient number, since it is larger than the sum of its proper divisors (840218).

1668586 is a wasteful number, since it uses less digits than its factorization.

1668586 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1976.

The product of its digits is 69120, while the sum is 40.

The square root of 1668586 is about 1291.7375894507. The cubic root of 1668586 is about 118.6086051160.

The spelling of 1668586 in words is "one million, six hundred sixty-eight thousand, five hundred eighty-six".