396689 has 4 divisors (see below), whose sum is σ = 399156. Its totient is φ = 394224.

The previous prime is 396679. The next prime is 396703. The reversal of 396689 is 986693.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 250000 + 146689 = 500^2 + 383^2 .

It is a cyclic number.

It is not a de Polignac number, because 396689 - 2¹² = 392593 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (396619) 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, 974 + ... + 1319.

It is an arithmetic number, because the mean of its divisors is an integer number (99789).

2³⁹⁶⁶⁸⁹ is an apocalyptic number.

It is an amenable number.

396689 is a deficient number, since it is larger than the sum of its proper divisors (2467).

396689 is a wasteful number, since it uses less digits than its factorization.

396689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2466.

The product of its digits is 69984, while the sum is 41.

The square root of 396689 is about 629.8325174203. The cubic root of 396689 is about 73.4767693101.

The spelling of 396689 in words is "three hundred ninety-six thousand, six hundred eighty-nine".