669807 has 12 divisors (see below), whose sum is σ = 1018680. Its totient is φ = 422928.

The previous prime is 669791. The next prime is 669839. The reversal of 669807 is 708966.

It is not a de Polignac number, because 669807 - 2⁴ = 669791 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

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 669807.

It is not an unprimeable number, because it can be changed into a prime (669847) 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 11 ways as a sum of consecutive naturals, for example, 1788 + ... + 2129.

It is an arithmetic number, because the mean of its divisors is an integer number (84890).

2⁶⁶⁹⁸⁰⁷ is an apocalyptic number.

669807 is a deficient number, since it is larger than the sum of its proper divisors (348873).

669807 is a wasteful number, since it uses less digits than its factorization.

669807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3942 (or 3939 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 669807 is about 818.4173751821. The cubic root of 669807 is about 87.4949983536.

The spelling of 669807 in words is "six hundred sixty-nine thousand, eight hundred seven".