18229199 has 4 divisors (see below), whose sum is σ = 18372864. Its totient is φ = 18085536.

The previous prime is 18229177. The next prime is 18229201. The reversal of 18229199 is 99192281.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99192281 = 31 ⋅3199751.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18229199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18229109) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71642 + ... + 71895.

It is an arithmetic number, because the mean of its divisors is an integer number (4593216).

Almost surely, 2^18229199 is an apocalyptic number.

18229199 is a deficient number, since it is larger than the sum of its proper divisors (143665).

18229199 is a wasteful number, since it uses less digits than its factorization.

18229199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143664.

The product of its digits is 23328, while the sum is 41.

The square root of 18229199 is about 4269.5666056404. The cubic root of 18229199 is about 263.1818055053.

The spelling of 18229199 in words is "eighteen million, two hundred twenty-nine thousand, one hundred ninety-nine".