669897 has 16 divisors (see below), whose sum is σ = 1017280. Its totient is φ = 435456.

The previous prime is 669887. The next prime is 669901. The reversal of 669897 is 798966.

It is not a de Polignac number, because 669897 - 2¹⁰ = 668873 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 669897.

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 15 ways as a sum of consecutive naturals, for example, 873 + ... + 1449.

It is an arithmetic number, because the mean of its divisors is an integer number (63580).

2⁶⁶⁹⁸⁹⁷ is an apocalyptic number.

It is an amenable number.

669897 is a deficient number, since it is larger than the sum of its proper divisors (347383).

669897 is a wasteful number, since it uses less digits than its factorization.

669897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 629 (or 623 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 669897 is about 818.4723575051. The cubic root of 669897 is about 87.4989169934.

The spelling of 669897 in words is "six hundred sixty-nine thousand, eight hundred ninety-seven".