3940618221 has 64 divisors (see below), whose sum is σ = 6438144000. Its totient is φ = 2371057920.

The previous prime is 3940618181. The next prime is 3940618243. The reversal of 3940618221 is 1228160493.

3940618221 is a `hidden beast` number, since 39 + 4 + 0 + 618 + 2 + 2 + 1 = 666.

3940618221 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 3940618221 - 2¹³ = 3940610029 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3940618291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3904965 + ... + 3905973.

It is an arithmetic number, because the mean of its divisors is an integer number (100596000).

Almost surely, 2^3940618221 is an apocalyptic number.

It is an amenable number.

3940618221 is a deficient number, since it is larger than the sum of its proper divisors (2497525779).

3940618221 is a wasteful number, since it uses less digits than its factorization.

3940618221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1391 (or 1385 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 3940618221 is about 62774.3436524827. The cubic root of 3940618221 is about 1579.5066318628.

The spelling of 3940618221 in words is "three billion, nine hundred forty million, six hundred eighteen thousand, two hundred twenty-one".