667217 has 4 divisors (see below), whose sum is σ = 679860. Its totient is φ = 654576.

The previous prime is 667211. The next prime is 667229. The reversal of 667217 is 712766.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 246016 + 421201 = 496^2 + 649^2 .

It is a cyclic number.

It is not a de Polignac number, because 667217 - 2¹⁴ = 650833 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 667217.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 667217.

It is not an unprimeable number, because it can be changed into a prime (667211) 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, 6242 + ... + 6347.

It is an arithmetic number, because the mean of its divisors is an integer number (169965).

2⁶⁶⁷²¹⁷ is an apocalyptic number.

It is an amenable number.

667217 is a deficient number, since it is larger than the sum of its proper divisors (12643).

667217 is a wasteful number, since it uses less digits than its factorization.

667217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12642.

The product of its digits is 3528, while the sum is 29.

The square root of 667217 is about 816.8335203700. The cubic root of 667217 is about 87.3820778847.

The spelling of 667217 in words is "six hundred sixty-seven thousand, two hundred seventeen".