396191 has 4 divisors (see below), whose sum is σ = 399000. Its totient is φ = 393384.

The previous prime is 396181. The next prime is 396197. The reversal of 396191 is 191693.

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

It is a cyclic number.

It is not a de Polignac number, because 396191 - 2¹⁸ = 134047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (396197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1181 + ... + 1478.

It is an arithmetic number, because the mean of its divisors is an integer number (99750).

2³⁹⁶¹⁹¹ is an apocalyptic number.

396191 is a deficient number, since it is larger than the sum of its proper divisors (2809).

396191 is a wasteful number, since it uses less digits than its factorization.

396191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2808.

The product of its digits is 1458, while the sum is 29.

The square root of 396191 is about 629.4370500693. The cubic root of 396191 is about 73.4460090638.

The spelling of 396191 in words is "three hundred ninety-six thousand, one hundred ninety-one".