8438147891 has 16 divisors (see below), whose sum is σ = 8625722976. Its totient is φ = 8252845056.

The previous prime is 8438147849. The next prime is 8438147911. The reversal of 8438147891 is 1987418348.

It is a happy number.

It is not a de Polignac number, because 8438147891 - 2³⁰ = 7364406067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8438147801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4812671 + ... + 4814423.

It is an arithmetic number, because the mean of its divisors is an integer number (539107686).

Almost surely, 2^8438147891 is an apocalyptic number.

8438147891 is a deficient number, since it is larger than the sum of its proper divisors (187575085).

8438147891 is a wasteful number, since it uses less digits than its factorization.

8438147891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2342.

The product of its digits is 1548288, while the sum is 53.

The square root of 8438147891 is about 91859.3919585798. The cubic root of 8438147891 is about 2035.8653191642.

The spelling of 8438147891 in words is "eight billion, four hundred thirty-eight million, one hundred forty-seven thousand, eight hundred ninety-one".