3940221 has 8 divisors (see below), whose sum is σ = 5264224. Its totient is φ = 2621520.

The previous prime is 3940217. The next prime is 3940231. The reversal of 3940221 is 1220493.

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

It is not a de Polignac number, because 3940221 - 2² = 3940217 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3940231) 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, 990 + ... + 2976.

It is an arithmetic number, because the mean of its divisors is an integer number (658028).

Almost surely, 2^3940221 is an apocalyptic number.

It is an amenable number.

3940221 is a deficient number, since it is larger than the sum of its proper divisors (1324003).

3940221 is a wasteful number, since it uses less digits than its factorization.

3940221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2651.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 3940221 is about 1984.9989924431. The cubic root of 3940221 is about 157.9453557764.

The spelling of 3940221 in words is "three million, nine hundred forty thousand, two hundred twenty-one".