669697 has 8 divisors (see below), whose sum is σ = 792000. Its totient is φ = 554064.

The previous prime is 669689. The next prime is 669701. The reversal of 669697 is 796966.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 669697 - 2³ = 669689 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 669697.

It is not an unprimeable number, because it can be changed into a prime (669607) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1447 + ... + 1852.

It is an arithmetic number, because the mean of its divisors is an integer number (99000).

It is a Proth number, since it is equal to 327 ⋅ 2¹¹ + 1 and 327 < 2¹¹.

2⁶⁶⁹⁶⁹⁷ is an apocalyptic number.

It is an amenable number.

669697 is a deficient number, since it is larger than the sum of its proper divisors (122303).

669697 is a wasteful number, since it uses less digits than its factorization.

669697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3335.

The product of its digits is 122472, while the sum is 43.

The square root of 669697 is about 818.3501695485. The cubic root of 669697 is about 87.4902084281.

The spelling of 669697 in words is "six hundred sixty-nine thousand, six hundred ninety-seven".