989896823 has 2 divisors, whose sum is σ = 989896824. Its totient is φ = 989896822.

The previous prime is 989896819. The next prime is 989896841. The reversal of 989896823 is 328698989.

It is a weak prime.

It is an emirp because it is prime and its reverse (328698989) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 989896823 - 2² = 989896819 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (989896813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494948411 + 494948412.

It is an arithmetic number, because the mean of its divisors is an integer number (494948412).

Almost surely, 2^989896823 is an apocalyptic number.

989896823 is a deficient number, since it is larger than the sum of its proper divisors (1).

989896823 is an equidigital number, since it uses as much as digits as its factorization.

989896823 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13436928, while the sum is 62.

The square root of 989896823 is about 31462.6258122236. The cubic root of 989896823 is about 996.6208686663.

The spelling of 989896823 in words is "nine hundred eighty-nine million, eight hundred ninety-six thousand, eight hundred twenty-three".