998392391 has 2 divisors, whose sum is σ = 998392392. Its totient is φ = 998392390.

The previous prime is 998392333. The next prime is 998392397. The reversal of 998392391 is 193293899.

It is a strong prime.

It is an emirp because it is prime and its reverse (193293899) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-998392391 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998392397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499196195 + 499196196.

It is an arithmetic number, because the mean of its divisors is an integer number (499196196).

Almost surely, 2^998392391 is an apocalyptic number.

998392391 is a deficient number, since it is larger than the sum of its proper divisors (1).

998392391 is an equidigital number, since it uses as much as digits as its factorization.

998392391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 944784, while the sum is 53.

The square root of 998392391 is about 31597.3478475647. The cubic root of 998392391 is about 999.4638429203.

The spelling of 998392391 in words is "nine hundred ninety-eight million, three hundred ninety-two thousand, three hundred ninety-one".