998623198 has 4 divisors (see below), whose sum is σ = 1497934800. Its totient is φ = 499311598.

The previous prime is 998623187. The next prime is 998623211. The reversal of 998623198 is 891326899.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 891326899 = 109 ⋅8177311.

It is a congruent number.

It is an unprimeable number.

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, 249655798 + ... + 249655801.

It is an arithmetic number, because the mean of its divisors is an integer number (374483700).

Almost surely, 2^998623198 is an apocalyptic number.

998623198 is a deficient number, since it is larger than the sum of its proper divisors (499311602).

998623198 is a wasteful number, since it uses less digits than its factorization.

998623198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 499311601.

The product of its digits is 1679616, while the sum is 55.

The square root of 998623198 is about 31600.9999525331. Note that the first 4 decimals coincide. The cubic root of 998623198 is about 999.5408552183.

The spelling of 998623198 in words is "nine hundred ninety-eight million, six hundred twenty-three thousand, one hundred ninety-eight".