18198099 has 6 divisors (see below), whose sum is σ = 26286156. Its totient is φ = 12132060.

The previous prime is 18198091. The next prime is 18198139. The reversal of 18198099 is 99089181.

It is not a de Polignac number, because 18198099 - 2³ = 18198091 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18198091) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 1010997 + ... + 1011014.

It is an arithmetic number, because the mean of its divisors is an integer number (4381026).

Almost surely, 2^18198099 is an apocalyptic number.

18198099 is a deficient number, since it is larger than the sum of its proper divisors (8088057).

18198099 is a wasteful number, since it uses less digits than its factorization.

18198099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2022017 (or 2022014 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 45.

The square root of 18198099 is about 4265.9229950856. The cubic root of 18198099 is about 263.0320528433.

The spelling of 18198099 in words is "eighteen million, one hundred ninety-eight thousand, ninety-nine".