669929 has 8 divisors (see below), whose sum is σ = 746760. Its totient is φ = 596736.

The previous prime is 669923. The next prime is 669931. The reversal of 669929 is 929966.

It is a happy number.

669929 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 29929 + 640000 = 173^2 + 800^2 .

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 669929 - 2⁴ = 669913 is a prime.

It is a d-powerful number, because it can be written as 6 + 6⁶ + 9 + 9⁵ + 2¹⁵ + 9⁶ .

It is a Duffinian number.

It is a Curzon 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 669929.

It is not an unprimeable number, because it can be changed into a prime (669923) 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, 512 + ... + 1265.

It is an arithmetic number, because the mean of its divisors is an integer number (93345).

2⁶⁶⁹⁹²⁹ is an apocalyptic number.

It is an amenable number.

669929 is a deficient number, since it is larger than the sum of its proper divisors (76831).

669929 is a wasteful number, since it uses less digits than its factorization.

669929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1819.

The product of its digits is 52488, while the sum is 41.

The square root of 669929 is about 818.4919058855. The cubic root of 669929 is about 87.5003102030.

The spelling of 669929 in words is "six hundred sixty-nine thousand, nine hundred twenty-nine".