396857 has 4 divisors (see below), whose sum is σ = 398820. Its totient is φ = 394896.

The previous prime is 396833. The next prime is 396871. The reversal of 396857 is 758693.

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 287296 + 109561 = 536^2 + 331^2 .

It is a cyclic number.

It is not a de Polignac number, because 396857 - 2⁸ = 396601 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 396857.

It is not an unprimeable number, because it can be changed into a prime (396887) 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, 638 + ... + 1095.

It is an arithmetic number, because the mean of its divisors is an integer number (99705).

2³⁹⁶⁸⁵⁷ is an apocalyptic number.

It is an amenable number.

396857 is a deficient number, since it is larger than the sum of its proper divisors (1963).

396857 is a wasteful number, since it uses less digits than its factorization.

396857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1962.

The product of its digits is 45360, while the sum is 38.

The square root of 396857 is about 629.9658720915. The cubic root of 396857 is about 73.4871404531.

The spelling of 396857 in words is "three hundred ninety-six thousand, eight hundred fifty-seven".