3936221 has 4 divisors (see below), whose sum is σ = 3943200. Its totient is φ = 3929244.

The previous prime is 3936217. The next prime is 3936223. The reversal of 3936221 is 1226393.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3936221 - 2² = 3936217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3936223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2561 + ... + 3798.

It is an arithmetic number, because the mean of its divisors is an integer number (985800).

Almost surely, 2^3936221 is an apocalyptic number.

It is an amenable number.

3936221 is a deficient number, since it is larger than the sum of its proper divisors (6979).

3936221 is an equidigital number, since it uses as much as digits as its factorization.

3936221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6978.

The product of its digits is 1944, while the sum is 26.

The square root of 3936221 is about 1983.9911794159. The cubic root of 3936221 is about 157.8918904731.

The spelling of 3936221 in words is "three million, nine hundred thirty-six thousand, two hundred twenty-one".