394403 has 4 divisors (see below), whose sum is σ = 397200. Its totient is φ = 391608.

The previous prime is 394393. The next prime is 394409. The reversal of 394403 is 304493.

Added to its reverse (304493) it gives a square (698896 = 836²).

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 304493 = 7 ⋅43499.

It is a cyclic number.

It is not a de Polignac number, because 394403 - 2¹² = 390307 is a prime.

It is a Duffinian 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 3 ways as a sum of consecutive naturals, for example, 1175 + ... + 1472.

It is an arithmetic number, because the mean of its divisors is an integer number (99300).

2³⁹⁴⁴⁰³ is an apocalyptic number.

394403 is a deficient number, since it is larger than the sum of its proper divisors (2797).

394403 is a wasteful number, since it uses less digits than its factorization.

394403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2796.

The product of its (nonzero) digits is 1296, while the sum is 23.

The square root of 394403 is about 628.0151272063. The cubic root of 394403 is about 73.3353557753.

Adding to 394403 its reverse (304493), we get a palindrome (698896).

It can be divided in two parts, 394 and 403, that added together give a palindrome (797).

The spelling of 394403 in words is "three hundred ninety-four thousand, four hundred three".