394606440493 has 4 divisors (see below), whose sum is σ = 394608752928. Its totient is φ = 394604128060.

The previous prime is 394606440451. The next prime is 394606440499. The reversal of 394606440493 is 394044606493.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 394044606493 = 677 ⋅582045209.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-394606440493 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 394606440493.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394606440499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 877921 + ... + 1248982.

It is an arithmetic number, because the mean of its divisors is an integer number (98652188232).

Almost surely, 2^394606440493 is an apocalyptic number.

It is an amenable number.

394606440493 is a deficient number, since it is larger than the sum of its proper divisors (2312435).

394606440493 is a wasteful number, since it uses less digits than its factorization.

394606440493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2312434.

The product of its (nonzero) digits is 6718464, while the sum is 52.

The spelling of 394606440493 in words is "three hundred ninety-four billion, six hundred six million, four hundred forty thousand, four hundred ninety-three".