998839939 has 2 divisors, whose sum is σ = 998839940. Its totient is φ = 998839938.

The previous prime is 998839903. The next prime is 998839949. The reversal of 998839939 is 939938899.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 998839939 - 2⁹ = 998839427 is a prime.

It is not a weakly prime, because it can be changed into another prime (998839949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499419969 + 499419970.

It is an arithmetic number, because the mean of its divisors is an integer number (499419970).

Almost surely, 2^998839939 is an apocalyptic number.

998839939 is a deficient number, since it is larger than the sum of its proper divisors (1).

998839939 is an equidigital number, since it uses as much as digits as its factorization.

998839939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34012224, while the sum is 67.

The square root of 998839939 is about 31604.4291041620. The cubic root of 998839939 is about 999.6131633767.

The spelling of 998839939 in words is "nine hundred ninety-eight million, eight hundred thirty-nine thousand, nine hundred thirty-nine".