998839799 has 2 divisors, whose sum is σ = 998839800. Its totient is φ = 998839798.

The previous prime is 998839741. The next prime is 998839873. The reversal of 998839799 is 997938899.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-998839799 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998839729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499419899 + 499419900.

It is an arithmetic number, because the mean of its divisors is an integer number (499419900).

Almost surely, 2^998839799 is an apocalyptic number.

998839799 is a deficient number, since it is larger than the sum of its proper divisors (1).

998839799 is an equidigital number, since it uses as much as digits as its factorization.

998839799 is an evil number, because the sum of its binary digits is even.

The product of its digits is 79361856, while the sum is 71.

The square root of 998839799 is about 31604.4268892825. The cubic root of 998839799 is about 999.6131166739.

The spelling of 998839799 in words is "nine hundred ninety-eight million, eight hundred thirty-nine thousand, seven hundred ninety-nine".