3966221 has 8 divisors (see below), whose sum is σ = 4577664. Its totient is φ = 3366000.

The previous prime is 3966211. The next prime is 3966223. The reversal of 3966221 is 1226693.

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 3966221 - 2¹⁰ = 3965197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3966223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2030 + ... + 3471.

It is an arithmetic number, because the mean of its divisors is an integer number (572208).

Almost surely, 2^3966221 is an apocalyptic number.

It is an amenable number.

3966221 is a deficient number, since it is larger than the sum of its proper divisors (611443).

3966221 is a wasteful number, since it uses less digits than its factorization.

3966221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5611.

The product of its digits is 3888, while the sum is 29.

The square root of 3966221 is about 1991.5373458713. The cubic root of 3966221 is about 158.2920012767.

The spelling of 3966221 in words is "three million, nine hundred sixty-six thousand, two hundred twenty-one".