667247 has 8 divisors (see below), whose sum is σ = 768000. Its totient is φ = 567864.

The previous prime is 667243. The next prime is 667273. The reversal of 667247 is 742766.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 667247 - 2² = 667243 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1154 + ... + 1632.

It is an arithmetic number, because the mean of its divisors is an integer number (96000).

2⁶⁶⁷²⁴⁷ is an apocalyptic number.

667247 is a deficient number, since it is larger than the sum of its proper divisors (100753).

667247 is a wasteful number, since it uses less digits than its factorization.

667247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 685.

The product of its digits is 14112, while the sum is 32.

The square root of 667247 is about 816.8518837586. The cubic root of 667247 is about 87.3833875151.

The spelling of 667247 in words is "six hundred sixty-seven thousand, two hundred forty-seven".