669912 has 32 divisors (see below), whose sum is σ = 1697280. Its totient is φ = 220320.

The previous prime is 669901. The next prime is 669913. The reversal of 669912 is 219966.

It is a happy number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 669912.

It is not an unprimeable number, because it can be changed into a prime (669913) by changing a digit.

669912 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2337 + ... + 2607.

It is an arithmetic number, because the mean of its divisors is an integer number (53040).

2⁶⁶⁹⁹¹² is an apocalyptic number.

It is an amenable number.

669912 is an abundant number, since it is smaller than the sum of its proper divisors (1027368).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

669912 is a wasteful number, since it uses less digits than its factorization.

669912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383 (or 379 counting only the distinct ones).

The product of its digits is 5832, while the sum is 33.

The square root of 669912 is about 818.4815208665. The cubic root of 669912 is about 87.4995700659.

The spelling of 669912 in words is "six hundred sixty-nine thousand, nine hundred twelve".