394663 has 4 divisors (see below), whose sum is σ = 395928. Its totient is φ = 393400.

The previous prime is 394643. The next prime is 394673. The reversal of 394663 is 366493.

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, and also an emirpimes, since its reverse is a distinct semiprime: 366493 = 379 ⋅967.

It is a cyclic number.

It is not a de Polignac number, because 394663 - 2⁵ = 394631 is a prime.

It is a Duffinian number.

394663 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394633) 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, 213 + ... + 913.

It is an arithmetic number, because the mean of its divisors is an integer number (98982).

2³⁹⁴⁶⁶³ is an apocalyptic number.

394663 is a deficient number, since it is larger than the sum of its proper divisors (1265).

394663 is an equidigital number, since it uses as much as digits as its factorization.

394663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1264.

The product of its digits is 11664, while the sum is 31.

The square root of 394663 is about 628.2220944857. Note that the first 3 decimals coincide. The cubic root of 394663 is about 73.3514670491.

The spelling of 394663 in words is "three hundred ninety-four thousand, six hundred sixty-three".