667249 has 4 divisors (see below), whose sum is σ = 727920. Its totient is φ = 606580.

The previous prime is 667243. The next prime is 667273. The reversal of 667249 is 942766.

667249 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 667249 - 2³ = 667241 is a prime.

It is an Ulam number.

It is a Duffinian 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 3 ways as a sum of consecutive naturals, for example, 30319 + ... + 30340.

It is an arithmetic number, because the mean of its divisors is an integer number (181980).

2⁶⁶⁷²⁴⁹ is an apocalyptic number.

It is an amenable number.

667249 is a deficient number, since it is larger than the sum of its proper divisors (60671).

667249 is a wasteful number, since it uses less digits than its factorization.

667249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60670.

The product of its digits is 18144, while the sum is 34.

The square root of 667249 is about 816.8531079698. The cubic root of 667249 is about 87.3834748224.

The spelling of 667249 in words is "six hundred sixty-seven thousand, two hundred forty-nine".