6394923905 has 4 divisors (see below), whose sum is σ = 7673908692. Its totient is φ = 5115939120.

The previous prime is 6394923869. The next prime is 6394923961. The reversal of 6394923905 is 5093294936.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3167888656 + 3227035249 = 56284^2 + 56807^2 .

It is not a de Polignac number, because 6394923905 - 2⁸ = 6394923649 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 639492386 + ... + 639492395.

It is an arithmetic number, because the mean of its divisors is an integer number (1918477173).

Almost surely, 2^6394923905 is an apocalyptic number.

It is an amenable number.

6394923905 is a deficient number, since it is larger than the sum of its proper divisors (1278984787).

6394923905 is a wasteful number, since it uses less digits than its factorization.

6394923905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1278984786.

The product of its (nonzero) digits is 1574640, while the sum is 50.

The square root of 6394923905 is about 79968.2681130459. The cubic root of 6394923905 is about 1856.1445464095.

The spelling of 6394923905 in words is "six billion, three hundred ninety-four million, nine hundred twenty-three thousand, nine hundred five".