998839979 has 2 divisors, whose sum is σ = 998839980. Its totient is φ = 998839978.

The previous prime is 998839951. The next prime is 998839987. The reversal of 998839979 is 979938899.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 998839979 - 2¹² = 998835883 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (998839939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499419989 + 499419990.

It is an arithmetic number, because the mean of its divisors is an integer number (499419990).

Almost surely, 2^998839979 is an apocalyptic number.

998839979 is a deficient number, since it is larger than the sum of its proper divisors (1).

998839979 is an equidigital number, since it uses as much as digits as its factorization.

998839979 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 998839979 is about 31604.4297369847. The cubic root of 998839979 is about 999.6131767204.

The spelling of 998839979 in words is "nine hundred ninety-eight million, eight hundred thirty-nine thousand, nine hundred seventy-nine".