669009 has 24 divisors (see below), whose sum is σ = 1042720. Its totient is φ = 380160.

The previous prime is 668999. The next prime is 669023. The reversal of 669009 is 900966.

It is not a de Polignac number, because 669009 - 2¹³ = 660817 is a prime.

It is not an unprimeable number, because it can be changed into a prime (669029) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6849 + ... + 6945.

2⁶⁶⁹⁰⁰⁹ is an apocalyptic number.

It is an amenable number.

669009 is a deficient number, since it is larger than the sum of its proper divisors (373711).

669009 is a wasteful number, since it uses less digits than its factorization.

669009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141 (or 130 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 30.

The square root of 669009 is about 817.9297035809. The cubic root of 669009 is about 87.4602377160.

The spelling of 669009 in words is "six hundred sixty-nine thousand, nine".