3964805 has 16 divisors (see below), whose sum is σ = 5167344. Its totient is φ = 2903040.

The previous prime is 3964801. The next prime is 3964811. The reversal of 3964805 is 5084693.

It can be written as a sum of positive squares in 8 ways, for example, as 1747684 + 2217121 = 1322^2 + 1489^2 .

It is not a de Polignac number, because 3964805 - 2² = 3964801 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3964801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11597 + ... + 11933.

It is an arithmetic number, because the mean of its divisors is an integer number (322959).

Almost surely, 2^3964805 is an apocalyptic number.

It is an amenable number.

3964805 is a deficient number, since it is larger than the sum of its proper divisors (1202539).

3964805 is a wasteful number, since it uses less digits than its factorization.

3964805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 536.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 3964805 is about 1991.1818098808. The cubic root of 3964805 is about 158.2731615001.

The spelling of 3964805 in words is "three million, nine hundred sixty-four thousand, eight hundred five".