669309 has 4 divisors (see below), whose sum is σ = 892416. Its totient is φ = 446204.

The previous prime is 669301. The next prime is 669311. The reversal of 669309 is 903966.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 669309 - 2³ = 669301 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 669309.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111549 + ... + 111554.

It is an arithmetic number, because the mean of its divisors is an integer number (223104).

2⁶⁶⁹³⁰⁹ is an apocalyptic number.

It is an amenable number.

669309 is a deficient number, since it is larger than the sum of its proper divisors (223107).

669309 is a wasteful number, since it uses less digits than its factorization.

669309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223106.

The product of its (nonzero) digits is 8748, while the sum is 33.

The square root of 669309 is about 818.1130728695. The cubic root of 669309 is about 87.4733088657.

The spelling of 669309 in words is "six hundred sixty-nine thousand, three hundred nine".