669849 has 4 divisors (see below), whose sum is σ = 893136. Its totient is φ = 446564.

The previous prime is 669847. The next prime is 669853. The reversal of 669849 is 948966.

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 669849 - 2¹ = 669847 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 669849.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 669849.

It is not an unprimeable number, because it can be changed into a prime (669847) 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, 111639 + ... + 111644.

It is an arithmetic number, because the mean of its divisors is an integer number (223284).

2⁶⁶⁹⁸⁴⁹ is an apocalyptic number.

It is an amenable number.

669849 is a deficient number, since it is larger than the sum of its proper divisors (223287).

669849 is a wasteful number, since it uses less digits than its factorization.

669849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223286.

The product of its digits is 93312, while the sum is 42.

The square root of 669849 is about 818.4430340592. The cubic root of 669849 is about 87.4968270958.

The spelling of 669849 in words is "six hundred sixty-nine thousand, eight hundred forty-nine".