394725009 has 16 divisors (see below), whose sum is σ = 608735232. Its totient is φ = 222838608.

The previous prime is 394725007. The next prime is 394725013. The reversal of 394725009 is 900527493.

It is not a de Polignac number, because 394725009 - 2¹ = 394725007 is a prime.

It is not an unprimeable number, because it can be changed into a prime (394725007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 111489 + ... + 114974.

It is an arithmetic number, because the mean of its divisors is an integer number (38045952).

Almost surely, 2^394725009 is an apocalyptic number.

It is an amenable number.

394725009 is a deficient number, since it is larger than the sum of its proper divisors (214010223).

394725009 is a wasteful number, since it uses less digits than its factorization.

394725009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226556.

The product of its (nonzero) digits is 68040, while the sum is 39.

The square root of 394725009 is about 19867.6875604586. The cubic root of 394725009 is about 733.5530848082.

The spelling of 394725009 in words is "three hundred ninety-four million, seven hundred twenty-five thousand, nine".