3820644121 has 12 divisors (see below), whose sum is σ = 4597680420. Its totient is φ = 3161911200.

The previous prime is 3820644083. The next prime is 3820644133. The reversal of 3820644121 is 1214460283.

It can be written as a sum of positive squares in 2 ways, for example, as 1248632896 + 2572011225 = 35336^2 + 50715^2 .

It is a de Polignac number, because none of the positive numbers 2^k-3820644121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3820644521) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1342930 + ... + 1345771.

It is an arithmetic number, because the mean of its divisors is an integer number (383140035).

Almost surely, 2^3820644121 is an apocalyptic number.

It is an amenable number.

3820644121 is a deficient number, since it is larger than the sum of its proper divisors (777036299).

3820644121 is a wasteful number, since it uses less digits than its factorization.

3820644121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2688744 (or 2688737 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 3820644121 is about 61811.3591583295. The cubic root of 3820644121 is about 1563.3115224303.

The spelling of 3820644121 in words is "three billion, eight hundred twenty million, six hundred forty-four thousand, one hundred twenty-one".