394944009 has 4 divisors (see below), whose sum is σ = 526592016. Its totient is φ = 263296004.

The previous prime is 394944007. The next prime is 394944023. The reversal of 394944009 is 900449493.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 394944009 - 2¹ = 394944007 is a prime.

It is not an unprimeable number, because it can be changed into a prime (394944001) 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, 65823999 + ... + 65824004.

It is an arithmetic number, because the mean of its divisors is an integer number (131648004).

Almost surely, 2^394944009 is an apocalyptic number.

It is an amenable number.

394944009 is a deficient number, since it is larger than the sum of its proper divisors (131648007).

394944009 is a wasteful number, since it uses less digits than its factorization.

394944009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131648006.

The product of its (nonzero) digits is 139968, while the sum is 42.

The square root of 394944009 is about 19873.1982579554. The cubic root of 394944009 is about 733.6887222106.

The spelling of 394944009 in words is "three hundred ninety-four million, nine hundred forty-four thousand, nine".