8143989 has 16 divisors (see below), whose sum is σ = 13063680. Its totient is φ = 4408560.

The previous prime is 8143987. The next prime is 8143997. The reversal of 8143989 is 9893418.

8143989 is digitally balanced in base 8, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 8143989 - 2¹ = 8143987 is a prime.

It is an Ulam number.

8143989 is strictly pandigital in base 8.

It is a self number, because there is not a number n which added to its sum of digits gives 8143989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8143987) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9807 + ... + 10604.

It is an arithmetic number, because the mean of its divisors is an integer number (816480).

Almost surely, 2^8143989 is an apocalyptic number.

It is an amenable number.

8143989 is a deficient number, since it is larger than the sum of its proper divisors (4919691).

8143989 is a wasteful number, since it uses less digits than its factorization.

8143989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20440.

The product of its digits is 62208, while the sum is 42.

The square root of 8143989 is about 2853.7675098017. The cubic root of 8143989 is about 201.1927805643.

The spelling of 8143989 in words is "eight million, one hundred forty-three thousand, nine hundred eighty-nine".