998839649 has 2 divisors, whose sum is σ = 998839650. Its totient is φ = 998839648.

The previous prime is 998839603. The next prime is 998839697. The reversal of 998839649 is 946938899.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 522945424 + 475894225 = 22868^2 + 21815^2 .

It is a cyclic number.

It is not a de Polignac number, because 998839649 - 2⁸ = 998839393 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (998839249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499419824 + 499419825.

It is an arithmetic number, because the mean of its divisors is an integer number (499419825).

Almost surely, 2^998839649 is an apocalyptic number.

It is an amenable number.

998839649 is a deficient number, since it is larger than the sum of its proper divisors (1).

998839649 is an equidigital number, since it uses as much as digits as its factorization.

998839649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30233088, while the sum is 65.

The square root of 998839649 is about 31604.4245161971. The cubic root of 998839649 is about 999.6130666352.

The spelling of 998839649 in words is "nine hundred ninety-eight million, eight hundred thirty-nine thousand, six hundred forty-nine".