667189 has 4 divisors (see below), whose sum is σ = 673420. Its totient is φ = 660960.

The previous prime is 667181. The next prime is 667211. The reversal of 667189 is 981766.

667189 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.

It can be written as a sum of positive squares in 2 ways, for example, as 255025 + 412164 = 505^2 + 642^2 .

It is a cyclic number.

It is not a de Polignac number, because 667189 - 2³ = 667181 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 (667181) 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, 2952 + ... + 3169.

It is an arithmetic number, because the mean of its divisors is an integer number (168355).

2⁶⁶⁷¹⁸⁹ is an apocalyptic number.

It is an amenable number.

667189 is a deficient number, since it is larger than the sum of its proper divisors (6231).

667189 is a wasteful number, since it uses less digits than its factorization.

667189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6230.

The product of its digits is 18144, while the sum is 37.

The square root of 667189 is about 816.8163808348. The cubic root of 667189 is about 87.3808555275.

It can be divided in two parts, 66 and 7189, that multiplied together give a palindrome (474474).

The spelling of 667189 in words is "six hundred sixty-seven thousand, one hundred eighty-nine".