669404 has 12 divisors (see below), whose sum is σ = 1203384. Its totient is φ = 325584.

The previous prime is 669401. The next prime is 669413. The reversal of 669404 is 404966.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669401) 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, 2114 + ... + 2409.

It is an arithmetic number, because the mean of its divisors is an integer number (100282).

2⁶⁶⁹⁴⁰⁴ is an apocalyptic number.

It is an amenable number.

669404 is a deficient number, since it is larger than the sum of its proper divisors (533980).

669404 is a wasteful number, since it uses less digits than its factorization.

669404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4564 (or 4562 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 669404 is about 818.1711312433. The cubic root of 669404 is about 87.4774472488.

The spelling of 669404 in words is "six hundred sixty-nine thousand, four hundred four".