3913221 has 16 divisors (see below), whose sum is σ = 5915840. Its totient is φ = 2280960.

The previous prime is 3913199. The next prime is 3913237. The reversal of 3913221 is 1223193.

It is a happy number.

It is not a de Polignac number, because 3913221 - 2⁷ = 3913093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3913121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1900 + ... + 3381.

It is an arithmetic number, because the mean of its divisors is an integer number (369740).

Almost surely, 2^3913221 is an apocalyptic number.

It is an amenable number.

3913221 is a deficient number, since it is larger than the sum of its proper divisors (2002619).

3913221 is a wasteful number, since it uses less digits than its factorization.

3913221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5316.

The product of its digits is 324, while the sum is 21.

The square root of 3913221 is about 1978.1862905197. The cubic root of 3913221 is about 157.5837599326.

The spelling of 3913221 in words is "three million, nine hundred thirteen thousand, two hundred twenty-one".