998396887 has 2 divisors, whose sum is σ = 998396888. Its totient is φ = 998396886.

The previous prime is 998396873. The next prime is 998396909. The reversal of 998396887 is 788693899.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 998396887 - 2¹⁹ = 997872599 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998396807) 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, 499198443 + 499198444.

It is an arithmetic number, because the mean of its divisors is an integer number (499198444).

Almost surely, 2^998396887 is an apocalyptic number.

998396887 is a deficient number, since it is larger than the sum of its proper divisors (1).

998396887 is an equidigital number, since it uses as much as digits as its factorization.

998396887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 47029248, while the sum is 67.

The square root of 998396887 is about 31597.4189926962. The cubic root of 998396887 is about 999.4653431930.

The spelling of 998396887 in words is "nine hundred ninety-eight million, three hundred ninety-six thousand, eight hundred eighty-seven".