3978265 has 4 divisors (see below), whose sum is σ = 4773924. Its totient is φ = 3182608.

The previous prime is 3978263. The next prime is 3978269. The reversal of 3978265 is 5628793.

3978265 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 1628176 + 2350089 = 1276^2 + 1533^2 .

It is a cyclic number.

It is not a de Polignac number, because 3978265 - 2¹ = 3978263 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

3978265 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (3978263) 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, 397822 + ... + 397831.

It is an arithmetic number, because the mean of its divisors is an integer number (1193481).

Almost surely, 2^3978265 is an apocalyptic number.

It is an amenable number.

3978265 is a deficient number, since it is larger than the sum of its proper divisors (795659).

3978265 is an equidigital number, since it uses as much as digits as its factorization.

3978265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 795658.

The product of its digits is 90720, while the sum is 40.

The square root of 3978265 is about 1994.5588484675. The cubic root of 3978265 is about 158.4520648365.

The spelling of 3978265 in words is "three million, nine hundred seventy-eight thousand, two hundred sixty-five".