669759 has 4 divisors (see below), whose sum is σ = 893016. Its totient is φ = 446504.

The previous prime is 669733. The next prime is 669763. The reversal of 669759 is 957966.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 669759 - 2⁹ = 669247 is a prime.

It is an Ulam number.

It is a D-number.

669759 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 669759.

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 669759.

It is not an unprimeable number, because it can be changed into a prime (669359) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111624 + ... + 111629.

It is an arithmetic number, because the mean of its divisors is an integer number (223254).

2⁶⁶⁹⁷⁵⁹ is an apocalyptic number.

669759 is a deficient number, since it is larger than the sum of its proper divisors (223257).

669759 is a wasteful number, since it uses less digits than its factorization.

669759 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223256.

The product of its digits is 102060, while the sum is 42.

The square root of 669759 is about 818.3880497661. The cubic root of 669759 is about 87.4929082688.

The spelling of 669759 in words is "six hundred sixty-nine thousand, seven hundred fifty-nine".