394009 has 24 divisors (see below), whose sum is σ = 541728. Its totient is φ = 282240.

The previous prime is 394007. The next prime is 394019. The reversal of 394009 is 900493.

It is not a de Polignac number, because 394009 - 2¹ = 394007 is a prime.

It is not an unprimeable number, because it can be changed into a prime (394007) 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 23 ways as a sum of consecutive naturals, for example, 9142 + ... + 9184.

It is an arithmetic number, because the mean of its divisors is an integer number (22572).

2³⁹⁴⁰⁰⁹ is an apocalyptic number.

It is an amenable number.

394009 is a deficient number, since it is larger than the sum of its proper divisors (147719).

394009 is a wasteful number, since it uses less digits than its factorization.

394009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85 (or 78 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 394009 is about 627.7013621142. The cubic root of 394009 is about 73.3109274984.

The spelling of 394009 in words is "three hundred ninety-four thousand, nine".