394665 has 16 divisors (see below), whose sum is σ = 641088. Its totient is φ = 207296.

The previous prime is 394643. The next prime is 394673. The reversal of 394665 is 566493.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 394665 - 2⁵ = 394633 is a prime.

It is a Curzon number.

394665 is a lucky number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1087 + ... + 1403.

It is an arithmetic number, because the mean of its divisors is an integer number (40068).

2³⁹⁴⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

394665 is a deficient number, since it is larger than the sum of its proper divisors (246423).

394665 is a wasteful number, since it uses less digits than its factorization.

394665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408.

The product of its digits is 19440, while the sum is 33.

The square root of 394665 is about 628.2236862774. The cubic root of 394665 is about 73.3515909545.

The spelling of 394665 in words is "three hundred ninety-four thousand, six hundred sixty-five".