3956521 has 8 divisors (see below), whose sum is σ = 4132424. Its totient is φ = 3784320.

The previous prime is 3956509. The next prime is 3956543. The reversal of 3956521 is 1256593.

It can be written as a sum of positive squares in 4 ways, for example, as 400 + 3956121 = 20^2 + 1989^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3956521 - 2¹¹ = 3954473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3956501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1381 + ... + 3133.

It is an arithmetic number, because the mean of its divisors is an integer number (516553).

Almost surely, 2^3956521 is an apocalyptic number.

It is an amenable number.

3956521 is a deficient number, since it is larger than the sum of its proper divisors (175903).

3956521 is a wasteful number, since it uses less digits than its factorization.

3956521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1851.

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

The square root of 3956521 is about 1989.1005505002. The cubic root of 3956521 is about 158.1628535037.

The spelling of 3956521 in words is "three million, nine hundred fifty-six thousand, five hundred twenty-one".