18122259 has 8 divisors (see below), whose sum is σ = 24942592. Its totient is φ = 11691720.

The previous prime is 18122243. The next prime is 18122309. The reversal of 18122259 is 95222181.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18122259 - 2⁴ = 18122243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18122059) 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, 97339 + ... + 97524.

It is an arithmetic number, because the mean of its divisors is an integer number (3117824).

Almost surely, 2^18122259 is an apocalyptic number.

18122259 is a deficient number, since it is larger than the sum of its proper divisors (6820333).

18122259 is a wasteful number, since it uses less digits than its factorization.

18122259 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194897.

The product of its digits is 2880, while the sum is 30.

The square root of 18122259 is about 4257.0246651858. The cubic root of 18122259 is about 262.6661515002. Note that the first 3 decimals are identical.

It can be divided in two parts, 18122 and 259, that added together give a palindrome (18381).

The spelling of 18122259 in words is "eighteen million, one hundred twenty-two thousand, two hundred fifty-nine".