18008199 has 24 divisors (see below), whose sum is σ = 28673424. Its totient is φ = 10800000.

The previous prime is 18008197. The next prime is 18008209. The reversal of 18008199 is 99180081.

It is not a de Polignac number, because 18008199 - 2¹ = 18008197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18008197) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9099 + ... + 10899.

It is an arithmetic number, because the mean of its divisors is an integer number (1194726).

Almost surely, 2^18008199 is an apocalyptic number.

18008199 is a deficient number, since it is larger than the sum of its proper divisors (10665225).

18008199 is a wasteful number, since it uses less digits than its factorization.

18008199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1919 (or 1916 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 36.

The square root of 18008199 is about 4243.6068385278. The cubic root of 18008199 is about 262.1139249709.

It can be divided in two parts, 1800 and 8199, that added together give a palindrome (9999).

The spelling of 18008199 in words is "eighteen million, eight thousand, one hundred ninety-nine".