394405 has 16 divisors (see below), whose sum is σ = 528768. Its totient is φ = 280000.

The previous prime is 394393. The next prime is 394409. The reversal of 394405 is 504493.

It is not a de Polignac number, because 394405 - 2¹⁵ = 361637 is a prime.

It is an Ulam number.

It is a Duffinian number.

394405 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 394405.

It is a congruent number.

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

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 in 15 ways as a sum of consecutive naturals, for example, 3855 + ... + 3955.

It is an arithmetic number, because the mean of its divisors is an integer number (33048).

2³⁹⁴⁴⁰⁵ is an apocalyptic number.

It is an amenable number.

394405 is a deficient number, since it is larger than the sum of its proper divisors (134363).

394405 is a wasteful number, since it uses less digits than its factorization.

394405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 394405 is about 628.0167195227. The cubic root of 394405 is about 73.3354797352.

Adding to 394405 its reverse (504493), we get a palindrome (898898).

It can be divided in two parts, 39 and 4405, that added together give a palindrome (4444).

The spelling of 394405 in words is "three hundred ninety-four thousand, four hundred five".