3949883506621 has 8 divisors (see below), whose sum is σ = 4269533791320. Its totient is φ = 3632492235072.

The previous prime is 3949883506603. The next prime is 3949883506663. The reversal of 3949883506621 is 1266053889493.

It can be written as a sum of positive squares in 4 ways, for example, as 355351900996 + 3594531605625 = 596114^2 + 1895925^2 .

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 3949883506621 - 2⁷ = 3949883506493 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 (3949883500621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 564749650 + ... + 564756643.

It is an arithmetic number, because the mean of its divisors is an integer number (533691723915).

Almost surely, 2^{3949883506621} is an apocalyptic number.

It is an amenable number.

3949883506621 is a deficient number, since it is larger than the sum of its proper divisors (319650284699).

3949883506621 is a wasteful number, since it uses less digits than its factorization.

3949883506621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1129506575.

The product of its (nonzero) digits is 67184640, while the sum is 64.

The spelling of 3949883506621 in words is "three trillion, nine hundred forty-nine billion, eight hundred eighty-three million, five hundred six thousand, six hundred twenty-one".