3920905 has 4 divisors (see below), whose sum is σ = 4705092. Its totient is φ = 3136720.

The previous prime is 3920899. The next prime is 3920909. The reversal of 3920905 is 5090293.

3920905 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 2393209 + 1527696 = 1547^2 + 1236^2 .

It is a de Polignac number, because none of the positive numbers 2^k-3920905 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3920909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 392086 + ... + 392095.

It is an arithmetic number, because the mean of its divisors is an integer number (1176273).

Almost surely, 2^3920905 is an apocalyptic number.

It is an amenable number.

3920905 is a deficient number, since it is larger than the sum of its proper divisors (784187).

3920905 is an equidigital number, since it uses as much as digits as its factorization.

3920905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 784186.

The product of its (nonzero) digits is 2430, while the sum is 28.

The square root of 3920905 is about 1980.1275211460. The cubic root of 3920905 is about 157.6868363086.

The spelling of 3920905 in words is "three million, nine hundred twenty thousand, nine hundred five".