394666 has 8 divisors (see below), whose sum is σ = 606564. Its totient is φ = 192480.

The previous prime is 394643. The next prime is 394673. The reversal of 394666 is 666493.

It can be written as a sum of positive squares in 2 ways, for example, as 385641 + 9025 = 621^2 + 95^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×394666² = 311522503112, which contains 22 as substring.

It is an Ulam number.

394666 is a modest number, since divided by 666 gives 394 as remainder.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2325 + ... + 2488.

2³⁹⁴⁶⁶⁶ is an apocalyptic number.

394666 is a deficient number, since it is larger than the sum of its proper divisors (211898).

394666 is a wasteful number, since it uses less digits than its factorization.

394666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4856.

The product of its digits is 23328, while the sum is 34.

The square root of 394666 is about 628.2244821718. The cubic root of 394666 is about 73.3516529071.

The spelling of 394666 in words is "three hundred ninety-four thousand, six hundred sixty-six".