3908423905 has 4 divisors (see below), whose sum is σ = 4690108692. Its totient is φ = 3126739120.

The previous prime is 3908423863. The next prime is 3908423927. The reversal of 3908423905 is 5093248093.

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 1688223744 + 2220200161 = 41088^2 + 47119^2 .

It is not a de Polignac number, because 3908423905 - 2¹³ = 3908415713 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, 390842386 + ... + 390842395.

It is an arithmetic number, because the mean of its divisors is an integer number (1172527173).

Almost surely, 2^3908423905 is an apocalyptic number.

It is an amenable number.

3908423905 is a deficient number, since it is larger than the sum of its proper divisors (781684787).

3908423905 is an equidigital number, since it uses as much as digits as its factorization.

3908423905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 781684786.

The product of its (nonzero) digits is 233280, while the sum is 43.

The square root of 3908423905 is about 62517.3888210312. The cubic root of 3908423905 is about 1575.1934127136.

The spelling of 3908423905 in words is "three billion, nine hundred eight million, four hundred twenty-three thousand, nine hundred five".