3881989871 has 4 divisors (see below), whose sum is σ = 3882685872. Its totient is φ = 3881293872.

The previous prime is 3881989817. The next prime is 3881989873. The reversal of 3881989871 is 1789891883.

It is a happy number.

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 3881989871 - 2¹⁸ = 3881727727 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 (3881989873) 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, 339566 + ... + 350811.

It is an arithmetic number, because the mean of its divisors is an integer number (970671468).

Almost surely, 2^3881989871 is an apocalyptic number.

3881989871 is a deficient number, since it is larger than the sum of its proper divisors (696001).

3881989871 is an equidigital number, since it uses as much as digits as its factorization.

3881989871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 696000.

The product of its digits is 6967296, while the sum is 62.

The square root of 3881989871 is about 62305.6166890273. The cubic root of 3881989871 is about 1571.6341823652.

The spelling of 3881989871 in words is "three billion, eight hundred eighty-one million, nine hundred eighty-nine thousand, eight hundred seventy-one".