394391 has 4 divisors (see below), whose sum is σ = 395712. Its totient is φ = 393072.

The previous prime is 394369. The next prime is 394393. The reversal of 394391 is 193493.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 394391 - 2⁶ = 394327 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 (394393) 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, 26 + ... + 888.

It is an arithmetic number, because the mean of its divisors is an integer number (98928).

2³⁹⁴³⁹¹ is an apocalyptic number.

394391 is a deficient number, since it is larger than the sum of its proper divisors (1321).

394391 is an equidigital number, since it uses as much as digits as its factorization.

394391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1320.

The product of its digits is 2916, while the sum is 29.

The square root of 394391 is about 628.0055732237. The cubic root of 394391 is about 73.3346120071.

The spelling of 394391 in words is "three hundred ninety-four thousand, three hundred ninety-one".