998939387 has 2 divisors, whose sum is σ = 998939388. Its totient is φ = 998939386.

The previous prime is 998939377. The next prime is 998939411. The reversal of 998939387 is 783939899.

It is a weak prime.

It is an emirp because it is prime and its reverse (783939899) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 998939387 - 2⁴ = 998939371 is a prime.

It is not a weakly prime, because it can be changed into another prime (998939377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499469693 + 499469694.

It is an arithmetic number, because the mean of its divisors is an integer number (499469694).

Almost surely, 2^998939387 is an apocalyptic number.

998939387 is a deficient number, since it is larger than the sum of its proper divisors (1).

998939387 is an equidigital number, since it uses as much as digits as its factorization.

998939387 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26453952, while the sum is 65.

The square root of 998939387 is about 31606.0023887868. The cubic root of 998939387 is about 999.6463372708.

The spelling of 998939387 in words is "nine hundred ninety-eight million, nine hundred thirty-nine thousand, three hundred eighty-seven".