667009 has 4 divisors (see below), whose sum is σ = 762304. Its totient is φ = 571716.

The previous prime is 666989. The next prime is 667013. The reversal of 667009 is 900766.

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, and also an emirpimes, since its reverse is a distinct semiprime: 900766 = 2 ⋅450383.

It is a cyclic number.

It is not a de Polignac number, because 667009 - 2¹³ = 658817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (667019) 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, 47637 + ... + 47650.

It is an arithmetic number, because the mean of its divisors is an integer number (190576).

2⁶⁶⁷⁰⁰⁹ is an apocalyptic number.

It is an amenable number.

667009 is a deficient number, since it is larger than the sum of its proper divisors (95295).

667009 is an equidigital number, since it uses as much as digits as its factorization.

667009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95294.

The product of its (nonzero) digits is 2268, while the sum is 28.

The square root of 667009 is about 816.7061895198. The cubic root of 667009 is about 87.3729967006.

The spelling of 667009 in words is "six hundred sixty-seven thousand, nine".