998553843 has 12 divisors (see below), whose sum is σ = 1648406448. Its totient is φ = 570602160.

The previous prime is 998553841. The next prime is 998553851. The reversal of 998553843 is 348355899.

998553843 is a `hidden beast` number, since 9 + 9 + 8 + 553 + 84 + 3 = 666.

It is not a de Polignac number, because 998553843 - 2¹ = 998553841 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 998553843.

It is not an unprimeable number, because it can be changed into a prime (998553841) 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 in 11 ways as a sum of consecutive naturals, for example, 7924968 + ... + 7925093.

It is an arithmetic number, because the mean of its divisors is an integer number (137367204).

Almost surely, 2^998553843 is an apocalyptic number.

998553843 is a deficient number, since it is larger than the sum of its proper divisors (649852605).

998553843 is a wasteful number, since it uses less digits than its factorization.

998553843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15850074 (or 15850071 counting only the distinct ones).

The product of its digits is 4665600, while the sum is 54.

The square root of 998553843 is about 31599.9025789638. The cubic root of 998553843 is about 999.5177151053.

The spelling of 998553843 in words is "nine hundred ninety-eight million, five hundred fifty-three thousand, eight hundred forty-three".