394406 has 4 divisors (see below), whose sum is σ = 591612. Its totient is φ = 197202.

The previous prime is 394393. The next prime is 394409. The reversal of 394406 is 604493.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 604493 = 149 ⋅4057.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394409) by changing a digit.

394406 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98600 + ... + 98603.

It is an arithmetic number, because the mean of its divisors is an integer number (147903).

2³⁹⁴⁴⁰⁶ is an apocalyptic number.

394406 is a deficient number, since it is larger than the sum of its proper divisors (197206).

394406 is a wasteful number, since it uses less digits than its factorization.

394406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197205.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 394406 is about 628.0175156793. The cubic root of 394406 is about 73.3355417149.

Adding to 394406 its reverse (604493), we get a palindrome (998899).

The spelling of 394406 in words is "three hundred ninety-four thousand, four hundred six".