666039 has 8 divisors (see below), whose sum is σ = 968832. Its totient is φ = 403640.

The previous prime is 666031. The next prime is 666041. The reversal of 666039 is 930666.

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 666039 - 2³ = 666031 is a prime.

666039 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 665997 and 666015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10059 + ... + 10124.

It is an arithmetic number, because the mean of its divisors is an integer number (121104).

2⁶⁶⁶⁰³⁹ is an apocalyptic number.

666039 is a deficient number, since it is larger than the sum of its proper divisors (302793).

666039 is a wasteful number, since it uses less digits than its factorization.

666039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20197.

The product of its (nonzero) digits is 5832, while the sum is 30.

The square root of 666039 is about 816.1121246495. The cubic root of 666039 is about 87.3306219982.

It can be divided in two parts, 66 and 6039, that added together give a triangular number (6105 = T₁₁₀).

The spelling of 666039 in words is "six hundred sixty-six thousand, thirty-nine".