669449 has 4 divisors (see below), whose sum is σ = 730320. Its totient is φ = 608580.

The previous prime is 669437. The next prime is 669451. The reversal of 669449 is 944966.

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 669449 - 2⁴ = 669433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (669419) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30419 + ... + 30440.

It is an arithmetic number, because the mean of its divisors is an integer number (182580).

2⁶⁶⁹⁴⁴⁹ is an apocalyptic number.

It is an amenable number.

669449 is a deficient number, since it is larger than the sum of its proper divisors (60871).

669449 is a wasteful number, since it uses less digits than its factorization.

669449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60870.

The product of its digits is 46656, while the sum is 38.

The square root of 669449 is about 818.1986311404. The cubic root of 669449 is about 87.4794073989.

The spelling of 669449 in words is "six hundred sixty-nine thousand, four hundred forty-nine".