669941 has 4 divisors (see below), whose sum is σ = 691584. Its totient is φ = 648300.

The previous prime is 669937. The next prime is 669943. The reversal of 669941 is 149966.

669941 is nontrivially palindromic in base 5.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 669941 - 2² = 669937 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669943) 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, 10775 + ... + 10836.

It is an arithmetic number, because the mean of its divisors is an integer number (172896).

2⁶⁶⁹⁹⁴¹ is an apocalyptic number.

It is an amenable number.

669941 is a deficient number, since it is larger than the sum of its proper divisors (21643).

669941 is a wasteful number, since it uses less digits than its factorization.

669941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21642.

The product of its digits is 11664, while the sum is 35.

The square root of 669941 is about 818.4992364077. The cubic root of 669941 is about 87.5008326451.

The spelling of 669941 in words is "six hundred sixty-nine thousand, nine hundred forty-one".