989143 has 4 divisors (see below), whose sum is σ = 993168. Its totient is φ = 985120.

The previous prime is 989123. The next prime is 989171. The reversal of 989143 is 341989.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 341989 = 17 ⋅20117.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-989143 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 989099 and 989108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989123) 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, 1618 + ... + 2143.

It is an arithmetic number, because the mean of its divisors is an integer number (248292).

2⁹⁸⁹¹⁴³ is an apocalyptic number.

989143 is a deficient number, since it is larger than the sum of its proper divisors (4025).

989143 is a wasteful number, since it uses less digits than its factorization.

989143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4024.

The product of its digits is 7776, while the sum is 34.

The square root of 989143 is about 994.5566851618. The cubic root of 989143 is about 99.6367823265.

The spelling of 989143 in words is "nine hundred eighty-nine thousand, one hundred forty-three".