998819854 has 24 divisors (see below), whose sum is σ = 1586118240. Its totient is φ = 471664512.

The previous prime is 998819777. The next prime is 998819863. The reversal of 998819854 is 458918899.

It is a super-2 number, since 2×998819854² = 1995282201489162632, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 998819792 and 998819801.

It is a congruent number.

It is an unprimeable number.

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 in 11 ways as a sum of consecutive naturals, for example, 252907 + ... + 256825.

It is an arithmetic number, because the mean of its divisors is an integer number (66088260).

Almost surely, 2^998819854 is an apocalyptic number.

998819854 is a deficient number, since it is larger than the sum of its proper divisors (587298386).

998819854 is a wasteful number, since it uses less digits than its factorization.

998819854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4312 (or 4293 counting only the distinct ones).

The product of its digits is 7464960, while the sum is 61.

The square root of 998819854 is about 31604.1113464688. Note that the first 3 decimals coincide. The cubic root of 998819854 is about 999.6064631491.

The spelling of 998819854 in words is "nine hundred ninety-eight million, eight hundred nineteen thousand, eight hundred fifty-four".