989173998 has 16 divisors (see below), whose sum is σ = 2198164560. Its totient is φ = 329724648.

The previous prime is 989173981. The next prime is 989174003. The reversal of 989173998 is 899371989.

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 in 7 ways as a sum of consecutive naturals, for example, 9158965 + ... + 9159072.

It is an arithmetic number, because the mean of its divisors is an integer number (137385285).

Almost surely, 2^989173998 is an apocalyptic number.

989173998 is an abundant number, since it is smaller than the sum of its proper divisors (1208990562).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

989173998 is a wasteful number, since it uses less digits than its factorization.

989173998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18318048 (or 18318042 counting only the distinct ones).

The product of its digits is 8817984, while the sum is 63.

The square root of 989173998 is about 31451.1366726228. The cubic root of 989173998 is about 996.3782312939.

The spelling of 989173998 in words is "nine hundred eighty-nine million, one hundred seventy-three thousand, nine hundred ninety-eight".