669959 has 8 divisors (see below), whose sum is σ = 725040. Its totient is φ = 616896.

The previous prime is 669947. The next prime is 669971. The reversal of 669959 is 959966.

It is an interprime number because it is at equal distance from previous prime (669947) and next prime (669971).

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 669959 - 2⁴ = 669943 is a prime.

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 669959.

It is not an unprimeable number, because it can be changed into a prime (669989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 227 + ... + 1179.

It is an arithmetic number, because the mean of its divisors is an integer number (90630).

2⁶⁶⁹⁹⁵⁹ is an apocalyptic number.

669959 is a deficient number, since it is larger than the sum of its proper divisors (55081).

669959 is a wasteful number, since it uses less digits than its factorization.

669959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1009.

The product of its digits is 131220, while the sum is 44.

The square root of 669959 is about 818.5102320680. The cubic root of 669959 is about 87.5016162967.

The spelling of 669959 in words is "six hundred sixty-nine thousand, nine hundred fifty-nine".