669123 has 48 divisors (see below), whose sum is σ = 1281280. Its totient is φ = 326592.

The previous prime is 669121. The next prime is 669127. The reversal of 669123 is 321966.

It is a happy number.

669123 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Cunningham number, because it is equal to 818²-1.

It is not a de Polignac number, because 669123 - 2¹ = 669121 is a prime.

669123 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (669121) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15540 + ... + 15582.

2⁶⁶⁹¹²³ is an apocalyptic number.

669123 is a gapful number since it is divisible by the number (63) formed by its first and last digit.

669123 is a deficient number, since it is larger than the sum of its proper divisors (612157).

669123 is a wasteful number, since it uses less digits than its factorization.

669123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88 (or 85 counting only the distinct ones).

The product of its digits is 1944, while the sum is 27.

The square root of 669123 is about 817.9993887528. Note that the first 3 decimals coincide. The cubic root of 669123 is about 87.4652052131.

The spelling of 669123 in words is "six hundred sixty-nine thousand, one hundred twenty-three".