3936521 has 6 divisors (see below), whose sum is σ = 4032090. Its totient is φ = 3843168.

The previous prime is 3936509. The next prime is 3936523. The reversal of 3936521 is 1256393.

It can be written as a sum of positive squares in only one way, i.e., 2958400 + 978121 = 1720^2 + 989^2 .

It is not a de Polignac number, because 3936521 - 2¹⁰ = 3935497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3936523) 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, 785 + ... + 2913.

It is an arithmetic number, because the mean of its divisors is an integer number (672015).

Almost surely, 2^3936521 is an apocalyptic number.

It is an amenable number.

3936521 is a deficient number, since it is larger than the sum of its proper divisors (95569).

3936521 is an equidigital number, since it uses as much as digits as its factorization.

3936521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2215 (or 2172 counting only the distinct ones).

The product of its digits is 4860, while the sum is 29.

The square root of 3936521 is about 1984.0667831502. The cubic root of 3936521 is about 157.8959016269.

The spelling of 3936521 in words is "three million, nine hundred thirty-six thousand, five hundred twenty-one".