3818221 has 8 divisors (see below), whose sum is σ = 4384800. Its totient is φ = 3288240.

The previous prime is 3818219. The next prime is 3818231. The reversal of 3818221 is 1228183.

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 3818221 - 2¹ = 3818219 is a prime.

It is a Duffinian number.

3818221 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3818201) 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, 8926 + ... + 9343.

It is an arithmetic number, because the mean of its divisors is an integer number (548100).

Almost surely, 2^3818221 is an apocalyptic number.

It is an amenable number.

3818221 is a deficient number, since it is larger than the sum of its proper divisors (566579).

3818221 is a wasteful number, since it uses less digits than its factorization.

3818221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18299.

The product of its digits is 768, while the sum is 25.

The square root of 3818221 is about 1954.0268677784. The cubic root of 3818221 is about 156.2980959139.

The spelling of 3818221 in words is "three million, eight hundred eighteen thousand, two hundred twenty-one".