3944536991 has 4 divisors (see below), whose sum is σ = 3979444512. Its totient is φ = 3909629472.

The previous prime is 3944536957. The next prime is 3944537011. The reversal of 3944536991 is 1996354493.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 3944536991 - 2¹⁰ = 3944535967 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 (3944536951) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17453591 + ... + 17453816.

It is an arithmetic number, because the mean of its divisors is an integer number (994861128).

Almost surely, 2^3944536991 is an apocalyptic number.

3944536991 is a deficient number, since it is larger than the sum of its proper divisors (34907521).

3944536991 is a wasteful number, since it uses less digits than its factorization.

3944536991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34907520.

The product of its digits is 3149280, while the sum is 53.

The square root of 3944536991 is about 62805.5490462427. The cubic root of 3944536991 is about 1580.0300414894.

The spelling of 3944536991 in words is "three billion, nine hundred forty-four million, five hundred thirty-six thousand, nine hundred ninety-one".