3965905 has 4 divisors (see below), whose sum is σ = 4759092. Its totient is φ = 3172720.

The previous prime is 3965903. The next prime is 3965911. The reversal of 3965905 is 5095693.

3965905 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 2509056 + 1456849 = 1584^2 + 1207^2 .

It is not a de Polignac number, because 3965905 - 2¹ = 3965903 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3965903) 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, 396586 + ... + 396595.

It is an arithmetic number, because the mean of its divisors is an integer number (1189773).

Almost surely, 2^3965905 is an apocalyptic number.

It is an amenable number.

3965905 is a deficient number, since it is larger than the sum of its proper divisors (793187).

3965905 is an equidigital number, since it uses as much as digits as its factorization.

3965905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 793186.

The product of its (nonzero) digits is 36450, while the sum is 37.

The square root of 3965905 is about 1991.4580085957. The cubic root of 3965905 is about 158.2877973085.

The spelling of 3965905 in words is "three million, nine hundred sixty-five thousand, nine hundred five".