3995971138 has 4 divisors (see below), whose sum is σ = 5993956710. Its totient is φ = 1997985568.

The previous prime is 3995971129. The next prime is 3995971139. The reversal of 3995971138 is 8311795993.

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

It can be written as a sum of positive squares in only one way, i.e., 2282259529 + 1713711609 = 47773^2 + 41397^2 .

It is not an unprimeable number, because it can be changed into a prime (3995971139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 998992783 + ... + 998992786.

Almost surely, 2^3995971138 is an apocalyptic number.

3995971138 is a deficient number, since it is larger than the sum of its proper divisors (1997985572).

3995971138 is a wasteful number, since it uses less digits than its factorization.

3995971138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1997985571.

The product of its digits is 1837080, while the sum is 55.

The square root of 3995971138 is about 63213.6942283869. The cubic root of 3995971138 is about 1586.8679212875.

The spelling of 3995971138 in words is "three billion, nine hundred ninety-five million, nine hundred seventy-one thousand, one hundred thirty-eight".