998839729 has 2 divisors, whose sum is σ = 998839730. Its totient is φ = 998839728.

The previous prime is 998839697. The next prime is 998839741. The reversal of 998839729 is 927938899.

998839729 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 953142129 + 45697600 = 30873^2 + 6760^2 .

It is an emirp because it is prime and its reverse (927938899) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 998839729 - 2⁵ = 998839697 is a prime.

It is not a weakly prime, because it can be changed into another prime (998839799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499419864 + 499419865.

It is an arithmetic number, because the mean of its divisors is an integer number (499419865).

Almost surely, 2^998839729 is an apocalyptic number.

It is an amenable number.

998839729 is a deficient number, since it is larger than the sum of its proper divisors (1).

998839729 is an equidigital number, since it uses as much as digits as its factorization.

998839729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17635968, while the sum is 64.

The square root of 998839729 is about 31604.4257818426. The cubic root of 998839729 is about 999.6130933225.

The spelling of 998839729 in words is "nine hundred ninety-eight million, eight hundred thirty-nine thousand, seven hundred twenty-nine".