394188534434 has 4 divisors (see below), whose sum is σ = 591282801654. Its totient is φ = 197094267216.

The previous prime is 394188534427. The next prime is 394188534437. The reversal of 394188534434 is 434435881493.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 434435881493 = 149 ⋅2915677057.

It can be written as a sum of positive squares in only one way, i.e., 386452452409 + 7736082025 = 621653^2 + 87955^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 394188534434.

It is not an unprimeable number, because it can be changed into a prime (394188534437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98547133607 + ... + 98547133610.

Almost surely, 2^394188534434 is an apocalyptic number.

394188534434 is a deficient number, since it is larger than the sum of its proper divisors (197094267220).

394188534434 is a wasteful number, since it uses less digits than its factorization.

394188534434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197094267219.

The product of its digits is 19906560, while the sum is 56.

The spelling of 394188534434 in words is "three hundred ninety-four billion, one hundred eighty-eight million, five hundred thirty-four thousand, four hundred thirty-four".