3991439048 has 8 divisors (see below), whose sum is σ = 7483948230. Its totient is φ = 1995719520.

The previous prime is 3991439017. The next prime is 3991439107. The reversal of 3991439048 is 8409341993.

3991439048 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 2832581284 + 1158857764 = 53222^2 + 34042^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 3991438987 and 3991439005.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 249464933 + ... + 249464948.

Almost surely, 2^3991439048 is an apocalyptic number.

It is an amenable number.

3991439048 is a deficient number, since it is larger than the sum of its proper divisors (3492509182).

3991439048 is a wasteful number, since it uses less digits than its factorization.

3991439048 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 498929887 (or 498929883 counting only the distinct ones).

The product of its (nonzero) digits is 839808, while the sum is 50.

The square root of 3991439048 is about 63177.8366834446. The cubic root of 3991439048 is about 1586.2677710688.

The spelling of 3991439048 in words is "three billion, nine hundred ninety-one million, four hundred thirty-nine thousand, forty-eight".