394347009 has 16 divisors (see below), whose sum is σ = 602421120. Its totient is φ = 224774400.

The previous prime is 394347007. The next prime is 394347013. The reversal of 394347009 is 900743493.

It is not a de Polignac number, because 394347009 - 2¹ = 394347007 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (394347007) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14994 + ... + 31835.

It is an arithmetic number, because the mean of its divisors is an integer number (37651320).

Almost surely, 2^394347009 is an apocalyptic number.

It is an amenable number.

394347009 is a deficient number, since it is larger than the sum of its proper divisors (208074111).

394347009 is a wasteful number, since it uses less digits than its factorization.

394347009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47240.

The product of its (nonzero) digits is 81648, while the sum is 39.

The square root of 394347009 is about 19858.1723479277. The cubic root of 394347009 is about 733.3188528592.

The spelling of 394347009 in words is "three hundred ninety-four million, three hundred forty-seven thousand, nine".