989823143 has 2 divisors, whose sum is σ = 989823144. Its totient is φ = 989823142.

The previous prime is 989823139. The next prime is 989823167. The reversal of 989823143 is 341328989.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 989823143 - 2² = 989823139 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (989825143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494911571 + 494911572.

It is an arithmetic number, because the mean of its divisors is an integer number (494911572).

Almost surely, 2^989823143 is an apocalyptic number.

989823143 is a deficient number, since it is larger than the sum of its proper divisors (1).

989823143 is an equidigital number, since it uses as much as digits as its factorization.

989823143 is an evil number, because the sum of its binary digits is even.

The product of its digits is 373248, while the sum is 47.

The square root of 989823143 is about 31461.4548773575. The cubic root of 989823143 is about 996.5961412248.

The spelling of 989823143 in words is "nine hundred eighty-nine million, eight hundred twenty-three thousand, one hundred forty-three".