1918173198 has 16 divisors (see below), whose sum is σ = 3844229760. Its totient is φ = 638077176.

The previous prime is 1918173181. The next prime is 1918173209. The reversal of 1918173198 is 8913718191.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 325308 + ... + 331151.

It is an arithmetic number, because the mean of its divisors is an integer number (240264360).

Almost surely, 2^1918173198 is an apocalyptic number.

1918173198 is an abundant number, since it is smaller than the sum of its proper divisors (1926056562).

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

1918173198 is a wasteful number, since it uses less digits than its factorization.

1918173198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 656951.

The product of its digits is 108864, while the sum is 48.

The square root of 1918173198 is about 43796.9542091685. The cubic root of 1918173198 is about 1242.4986898979.

The spelling of 1918173198 in words is "one billion, nine hundred eighteen million, one hundred seventy-three thousand, one hundred ninety-eight".