394509439 has 4 divisors (see below), whose sum is σ = 395294256. Its totient is φ = 393724624.

The previous prime is 394509431. The next prime is 394509449. The reversal of 394509439 is 934905493.

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

It is a cyclic number.

It is not a de Polignac number, because 394509439 - 2³ = 394509431 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 (394509431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 391654 + ... + 392659.

It is an arithmetic number, because the mean of its divisors is an integer number (98823564).

Almost surely, 2^394509439 is an apocalyptic number.

394509439 is a deficient number, since it is larger than the sum of its proper divisors (784817).

394509439 is an equidigital number, since it uses as much as digits as its factorization.

394509439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 784816.

The product of its (nonzero) digits is 524880, while the sum is 46.

The square root of 394509439 is about 19862.2616788723. The cubic root of 394509439 is about 733.4195227668.

The spelling of 394509439 in words is "three hundred ninety-four million, five hundred nine thousand, four hundred thirty-nine".