3845221 has 2 divisors, whose sum is σ = 3845222. Its totient is φ = 3845220.

The previous prime is 3845183. The next prime is 3845251. The reversal of 3845221 is 1225483.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2873025 + 972196 = 1695^2 + 986^2 .

It is a cyclic number.

It is not a de Polignac number, because 3845221 - 2¹⁵ = 3812453 is a prime.

3845221 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3845251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1922610 + 1922611.

It is an arithmetic number, because the mean of its divisors is an integer number (1922611).

Almost surely, 2^3845221 is an apocalyptic number.

It is an amenable number.

3845221 is a deficient number, since it is larger than the sum of its proper divisors (1).

3845221 is an equidigital number, since it uses as much as digits as its factorization.

3845221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1920, while the sum is 25.

The square root of 3845221 is about 1960.9235069222. The cubic root of 3845221 is about 156.6656440756.

The spelling of 3845221 in words is "three million, eight hundred forty-five thousand, two hundred twenty-one".