3958221 has 4 divisors (see below), whose sum is σ = 5277632. Its totient is φ = 2638812.

The previous prime is 3958219. The next prime is 3958243. The reversal of 3958221 is 1228593.

It is a happy number.

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 not a de Polignac number, because 3958221 - 2¹ = 3958219 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3958211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 659701 + ... + 659706.

It is an arithmetic number, because the mean of its divisors is an integer number (1319408).

Almost surely, 2^3958221 is an apocalyptic number.

It is an amenable number.

3958221 is a deficient number, since it is larger than the sum of its proper divisors (1319411).

3958221 is a wasteful number, since it uses less digits than its factorization.

3958221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1319410.

The product of its digits is 4320, while the sum is 30.

The square root of 3958221 is about 1989.5278334318. The cubic root of 3958221 is about 158.1855028928.

The spelling of 3958221 in words is "three million, nine hundred fifty-eight thousand, two hundred twenty-one".