397689 has 8 divisors (see below), whose sum is σ = 558240. Its totient is φ = 251136.

The previous prime is 397687. The next prime is 397697. The reversal of 397689 is 986793.

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 397689 - 2¹ = 397687 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 397689.

It is not an unprimeable number, because it can be changed into a prime (397687) 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, 3432 + ... + 3545.

It is an arithmetic number, because the mean of its divisors is an integer number (69780).

2³⁹⁷⁶⁸⁹ is an apocalyptic number.

It is an amenable number.

397689 is a deficient number, since it is larger than the sum of its proper divisors (160551).

397689 is a wasteful number, since it uses less digits than its factorization.

397689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6999.

The product of its digits is 81648, while the sum is 42.

The square root of 397689 is about 630.6258795831. The cubic root of 397689 is about 73.5384592098.

The spelling of 397689 in words is "three hundred ninety-seven thousand, six hundred eighty-nine".