989823 has 4 divisors (see below), whose sum is σ = 1319768. Its totient is φ = 659880.

The previous prime is 989803. The next prime is 989827. The reversal of 989823 is 328989.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 328989 = 3 ⋅109663.

It is not a de Polignac number, because 989823 - 2¹⁴ = 973439 is a prime.

It is a D-number.

It is a Duffinian number.

989823 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989827) 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, 164968 + ... + 164973.

It is an arithmetic number, because the mean of its divisors is an integer number (329942).

2⁹⁸⁹⁸²³ is an apocalyptic number.

989823 is a deficient number, since it is larger than the sum of its proper divisors (329945).

989823 is a wasteful number, since it uses less digits than its factorization.

989823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329944.

The product of its digits is 31104, while the sum is 39.

The square root of 989823 is about 994.8984872840. The cubic root of 989823 is about 99.6596093232.

The spelling of 989823 in words is "nine hundred eighty-nine thousand, eight hundred twenty-three".