669189 has 4 divisors (see below), whose sum is σ = 892256. Its totient is φ = 446124.

The previous prime is 669181. The next prime is 669241. The reversal of 669189 is 981966.

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 not a de Polignac number, because 669189 - 2³ = 669181 is a prime.

It is a D-number.

It is a Duffinian number.

669189 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669181) 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, 111529 + ... + 111534.

It is an arithmetic number, because the mean of its divisors is an integer number (223064).

2⁶⁶⁹¹⁸⁹ is an apocalyptic number.

It is an amenable number.

669189 is a deficient number, since it is larger than the sum of its proper divisors (223067).

669189 is a wasteful number, since it uses less digits than its factorization.

669189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223066.

The product of its digits is 23328, while the sum is 39.

The square root of 669189 is about 818.0397300865. The cubic root of 669189 is about 87.4680808746.

It can be divided in two parts, 669 and 189, that added together give a palindrome (858).

The spelling of 669189 in words is "six hundred sixty-nine thousand, one hundred eighty-nine".