998648839 has 2 divisors, whose sum is σ = 998648840. Its totient is φ = 998648838.

The previous prime is 998648831. The next prime is 998648851. The reversal of 998648839 is 938846899.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 998648839 - 2³ = 998648831 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998648831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499324419 + 499324420.

It is an arithmetic number, because the mean of its divisors is an integer number (499324420).

Almost surely, 2^998648839 is an apocalyptic number.

998648839 is a deficient number, since it is larger than the sum of its proper divisors (1).

998648839 is an equidigital number, since it uses as much as digits as its factorization.

998648839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26873856, while the sum is 64.

The square root of 998648839 is about 31601.4056491163. The cubic root of 998648839 is about 999.5494099991.

The spelling of 998648839 in words is "nine hundred ninety-eight million, six hundred forty-eight thousand, eight hundred thirty-nine".