3843223621 has 2 divisors, whose sum is σ = 3843223622. Its totient is φ = 3843223620.

The previous prime is 3843223591. The next prime is 3843223639. The reversal of 3843223621 is 1263223483.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3510562500 + 332661121 = 59250^2 + 18239^2 .

It is an emirp because it is prime and its reverse (1263223483) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3843223621 - 2⁵ = 3843223589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3843223921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1921611810 + 1921611811.

It is an arithmetic number, because the mean of its divisors is an integer number (1921611811).

Almost surely, 2^3843223621 is an apocalyptic number.

It is an amenable number.

3843223621 is a deficient number, since it is larger than the sum of its proper divisors (1).

3843223621 is an equidigital number, since it uses as much as digits as its factorization.

3843223621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 34.

The square root of 3843223621 is about 61993.7385628581. The cubic root of 3843223621 is about 1566.3851300696.

The spelling of 3843223621 in words is "three billion, eight hundred forty-three million, two hundred twenty-three thousand, six hundred twenty-one".