998940223 has 2 divisors, whose sum is σ = 998940224. Its totient is φ = 998940222.

The previous prime is 998940221. The next prime is 998940259. The reversal of 998940223 is 322049899.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 998940223 - 2¹ = 998940221 is a prime.

Together with 998940221, it forms a pair of twin primes.

It is equal to p_50796658 and since 998940223 and 50796658 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998940221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499470111 + 499470112.

It is an arithmetic number, because the mean of its divisors is an integer number (499470112).

Almost surely, 2^998940223 is an apocalyptic number.

998940223 is a deficient number, since it is larger than the sum of its proper divisors (1).

998940223 is an equidigital number, since it uses as much as digits as its factorization.

998940223 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 279936, while the sum is 46.

The square root of 998940223 is about 31606.0156141200. The cubic root of 998940223 is about 999.6466161346.

The spelling of 998940223 in words is "nine hundred ninety-eight million, nine hundred forty thousand, two hundred twenty-three".