3948071981 has 16 divisors (see below), whose sum is σ = 4578685440. Its totient is φ = 3334417920.

The previous prime is 3948071927. The next prime is 3948072001. The reversal of 3948071981 is 1891708493.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3948071981 is a prime.

It is a super-2 number, since 2×3948071981² = 31174544734314528722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3948070981) 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 in 15 ways as a sum of consecutive naturals, for example, 142796 + ... + 168186.

It is an arithmetic number, because the mean of its divisors is an integer number (286167840).

Almost surely, 2^3948071981 is an apocalyptic number.

It is an amenable number.

3948071981 is a deficient number, since it is larger than the sum of its proper divisors (630613459).

3948071981 is a wasteful number, since it uses less digits than its factorization.

3948071981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25724.

The product of its (nonzero) digits is 435456, while the sum is 50.

The square root of 3948071981 is about 62833.6850821277. The cubic root of 3948071981 is about 1580.5018943115.

The spelling of 3948071981 in words is "three billion, nine hundred forty-eight million, seventy-one thousand, nine hundred eighty-one".