998705399 has 2 divisors, whose sum is σ = 998705400. Its totient is φ = 998705398.

The previous prime is 998705387. The next prime is 998705423. The reversal of 998705399 is 993507899.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 998705399 - 2¹² = 998701303 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998705339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499352699 + 499352700.

It is an arithmetic number, because the mean of its divisors is an integer number (499352700).

Almost surely, 2^998705399 is an apocalyptic number.

998705399 is a deficient number, since it is larger than the sum of its proper divisors (1).

998705399 is an equidigital number, since it uses as much as digits as its factorization.

998705399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5511240, while the sum is 59.

The square root of 998705399 is about 31602.3005333473. The cubic root of 998705399 is about 999.5682799780.

The spelling of 998705399 in words is "nine hundred ninety-eight million, seven hundred five thousand, three hundred ninety-nine".