3965521 has 6 divisors (see below), whose sum is σ = 4613010. Its totient is φ = 3398976.

The previous prime is 3965483. The next prime is 3965537. The reversal of 3965521 is 1255693.

It can be written as a sum of positive squares in only one way, i.e., 3651921 + 313600 = 1911^2 + 560^2 .

It is not a de Polignac number, because 3965521 - 2⁷ = 3965393 is a prime.

It is a d-powerful number, because it can be written as 3 + 9⁵ + 6³ + 5⁹ + 5⁹ + 2 + 1 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3965581) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 40416 + ... + 40513.

It is an arithmetic number, because the mean of its divisors is an integer number (768835).

Almost surely, 2^3965521 is an apocalyptic number.

It is an amenable number.

3965521 is a deficient number, since it is larger than the sum of its proper divisors (647489).

3965521 is an equidigital number, since it uses as much as digits as its factorization.

3965521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80943 (or 80936 counting only the distinct ones).

The product of its digits is 8100, while the sum is 31.

The square root of 3965521 is about 1991.3615944876. The cubic root of 3965521 is about 158.2826883883.

The spelling of 3965521 in words is "three million, nine hundred sixty-five thousand, five hundred twenty-one".