998843887 has 2 divisors, whose sum is σ = 998843888. Its totient is φ = 998843886.

The previous prime is 998843869. The next prime is 998843893. The reversal of 998843887 is 788348899.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 998843887 - 2⁷ = 998843759 is a prime.

It is a super-2 number, since 2×998843887² = 1995378221194537538, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998841887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499421943 + 499421944.

It is an arithmetic number, because the mean of its divisors is an integer number (499421944).

Almost surely, 2^998843887 is an apocalyptic number.

998843887 is a deficient number, since it is larger than the sum of its proper divisors (1).

998843887 is an equidigital number, since it uses as much as digits as its factorization.

998843887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27869184, while the sum is 64.

The square root of 998843887 is about 31604.4915637002. The cubic root of 998843887 is about 999.6144803937.

The spelling of 998843887 in words is "nine hundred ninety-eight million, eight hundred forty-three thousand, eight hundred eighty-seven".