3985881881 has 4 divisors (see below), whose sum is σ = 3986356992. Its totient is φ = 3985406772.

The previous prime is 3985881839. The next prime is 3985881917. The reversal of 3985881881 is 1881885893.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3985881881 - 2¹⁴ = 3985865497 is a prime.

It is a super-2 number, since 2×3985881881² = 31774508738568196322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3985881881.

It is not an unprimeable number, because it can be changed into a prime (3985881811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 224741 + ... + 241826.

It is an arithmetic number, because the mean of its divisors is an integer number (996589248).

Almost surely, 2^3985881881 is an apocalyptic number.

It is an amenable number.

3985881881 is a deficient number, since it is larger than the sum of its proper divisors (475111).

3985881881 is an equidigital number, since it uses as much as digits as its factorization.

3985881881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 475110.

The product of its digits is 4423680, while the sum is 59.

The square root of 3985881881 is about 63133.8410125663. The cubic root of 3985881881 is about 1585.5312573284.

The spelling of 3985881881 in words is "three billion, nine hundred eighty-five million, eight hundred eighty-one thousand, eight hundred eighty-one".