396391 has 4 divisors (see below), whose sum is σ = 397800. Its totient is φ = 394984.

The previous prime is 396379. The next prime is 396413. The reversal of 396391 is 193693.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 193693 = 109 ⋅1777.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-396391 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (396301) 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, 121 + ... + 898.

It is an arithmetic number, because the mean of its divisors is an integer number (99450).

2³⁹⁶³⁹¹ is an apocalyptic number.

396391 is a deficient number, since it is larger than the sum of its proper divisors (1409).

396391 is a wasteful number, since it uses less digits than its factorization.

396391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1408.

The product of its digits is 4374, while the sum is 31.

The square root of 396391 is about 629.5959021468. The cubic root of 396391 is about 73.4583656719.

It can be divided in two parts, 396 and 391, that added together give a palindrome (787).

The spelling of 396391 in words is "three hundred ninety-six thousand, three hundred ninety-one".