8642143 has 4 divisors (see below), whose sum is σ = 8788680. Its totient is φ = 8495608.

The previous prime is 8642141. The next prime is 8642147. The reversal of 8642143 is 3412468.

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 8642143 - 2¹ = 8642141 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 (8642141) 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, 73180 + ... + 73297.

It is an arithmetic number, because the mean of its divisors is an integer number (2197170).

Almost surely, 2^8642143 is an apocalyptic number.

8642143 is a deficient number, since it is larger than the sum of its proper divisors (146537).

8642143 is a wasteful number, since it uses less digits than its factorization.

8642143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146536.

The product of its digits is 4608, while the sum is 28.

The square root of 8642143 is about 2939.7522004414. The cubic root of 8642143 is about 205.2140773768.

The spelling of 8642143 in words is "eight million, six hundred forty-two thousand, one hundred forty-three".