998839697 has 2 divisors, whose sum is σ = 998839698. Its totient is φ = 998839696.

The previous prime is 998839649. The next prime is 998839729. The reversal of 998839697 is 796938899.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 975375361 + 23464336 = 31231^2 + 4844^2 .

It is a cyclic number.

It is not a de Polignac number, because 998839697 - 2¹⁸ = 998577553 is a prime.

It is not a weakly prime, because it can be changed into another prime (998839397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499419848 + 499419849.

It is an arithmetic number, because the mean of its divisors is an integer number (499419849).

Almost surely, 2^998839697 is an apocalyptic number.

It is an amenable number.

998839697 is a deficient number, since it is larger than the sum of its proper divisors (1).

998839697 is an equidigital number, since it uses as much as digits as its factorization.

998839697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52907904, while the sum is 68.

The square root of 998839697 is about 31604.4252755844. The cubic root of 998839697 is about 999.6130826476.

The spelling of 998839697 in words is "nine hundred ninety-eight million, eight hundred thirty-nine thousand, six hundred ninety-seven".