667297 has 4 divisors (see below), whose sum is σ = 669460. Its totient is φ = 665136.

The previous prime is 667283. The next prime is 667309. The reversal of 667297 is 792766.

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 519841 + 147456 = 721^2 + 384^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-667297 is a prime.

It is a Duffinian number.

667297 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667697) 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, 522 + ... + 1267.

It is an arithmetic number, because the mean of its divisors is an integer number (167365).

2⁶⁶⁷²⁹⁷ is an apocalyptic number.

It is an amenable number.

667297 is a deficient number, since it is larger than the sum of its proper divisors (2163).

667297 is a wasteful number, since it uses less digits than its factorization.

667297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2162.

The product of its digits is 31752, while the sum is 37.

The square root of 667297 is about 816.8824884890. The cubic root of 667297 is about 87.3855701452.

The spelling of 667297 in words is "six hundred sixty-seven thousand, two hundred ninety-seven".