669423 has 8 divisors (see below), whose sum is σ = 897408. Its totient is φ = 443864.

The previous prime is 669419. The next prime is 669433. The reversal of 669423 is 324966.

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 669423 - 2² = 669419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 190 + ... + 1172.

It is an arithmetic number, because the mean of its divisors is an integer number (112176).

2⁶⁶⁹⁴²³ is an apocalyptic number.

669423 is a deficient number, since it is larger than the sum of its proper divisors (227985).

669423 is a wasteful number, since it uses less digits than its factorization.

669423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1213.

The product of its digits is 7776, while the sum is 30.

The square root of 669423 is about 818.1827424237. The cubic root of 669423 is about 87.4782748785.

The spelling of 669423 in words is "six hundred sixty-nine thousand, four hundred twenty-three".