3944488621 has 8 divisors (see below), whose sum is σ = 4117944600. Its totient is φ = 3773528640.

The previous prime is 3944488619. The next prime is 3944488651. The reversal of 3944488621 is 1268844493.

It can be written as a sum of positive squares in 4 ways, for example, as 918938596 + 3025550025 = 30314^2 + 55005^2 .

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 3944488621 - 2¹ = 3944488619 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3944488651) 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, 620770 + ... + 627091.

It is an arithmetic number, because the mean of its divisors is an integer number (514743075).

Almost surely, 2^3944488621 is an apocalyptic number.

It is an amenable number.

3944488621 is a deficient number, since it is larger than the sum of its proper divisors (173455979).

3944488621 is a wasteful number, since it uses less digits than its factorization.

3944488621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1247999.

The product of its digits is 1327104, while the sum is 49.

The square root of 3944488621 is about 62805.1639676229. The cubic root of 3944488621 is about 1580.0235830748.

The spelling of 3944488621 in words is "three billion, nine hundred forty-four million, four hundred eighty-eight thousand, six hundred twenty-one".