394139347 has 4 divisors (see below), whose sum is σ = 450444976. Its totient is φ = 337833720.

The previous prime is 394139299. The next prime is 394139351. The reversal of 394139347 is 743931493.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-394139347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (394139047) 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, 28152804 + ... + 28152817.

It is an arithmetic number, because the mean of its divisors is an integer number (112611244).

Almost surely, 2^394139347 is an apocalyptic number.

394139347 is a deficient number, since it is larger than the sum of its proper divisors (56305629).

394139347 is an equidigital number, since it uses as much as digits as its factorization.

394139347 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56305628.

The product of its digits is 244944, while the sum is 43.

The square root of 394139347 is about 19852.9430311982. The cubic root of 394139347 is about 733.1901090587.

The spelling of 394139347 in words is "three hundred ninety-four million, one hundred thirty-nine thousand, three hundred forty-seven".