394640013 has 16 divisors (see below), whose sum is σ = 571750400. Its totient is φ = 241205040.

The previous prime is 394640009. The next prime is 394640063. The reversal of 394640013 is 310046493.

It is not a de Polignac number, because 394640013 - 2² = 394640009 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394640063) 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, 109903 + ... + 113436.

It is an arithmetic number, because the mean of its divisors is an integer number (35734400).

Almost surely, 2^394640013 is an apocalyptic number.

It is an amenable number.

394640013 is a deficient number, since it is larger than the sum of its proper divisors (177110387).

394640013 is a wasteful number, since it uses less digits than its factorization.

394640013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223392.

The product of its (nonzero) digits is 7776, while the sum is 30.

The square root of 394640013 is about 19865.5483941421. The cubic root of 394640013 is about 733.5004291177.

The spelling of 394640013 in words is "three hundred ninety-four million, six hundred forty thousand, thirteen".