998172518 has 16 divisors (see below), whose sum is σ = 1770158880. Its totient is φ = 413036736.

The previous prime is 998172517. The next prime is 998172521. The reversal of 998172518 is 815271899.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998172517) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1228871 + ... + 1229682.

It is an arithmetic number, because the mean of its divisors is an integer number (110634930).

Almost surely, 2^998172518 is an apocalyptic number.

998172518 is a deficient number, since it is larger than the sum of its proper divisors (771986362).

998172518 is a wasteful number, since it uses less digits than its factorization.

998172518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2458591.

The product of its digits is 362880, while the sum is 50.

The square root of 998172518 is about 31593.8683608070. The cubic root of 998172518 is about 999.3904678794.

The spelling of 998172518 in words is "nine hundred ninety-eight million, one hundred seventy-two thousand, five hundred eighteen".