18122239 has 4 divisors (see below), whose sum is σ = 18136120. Its totient is φ = 18108360.

The previous prime is 18122207. The next prime is 18122243. The reversal of 18122239 is 93222181.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18122239 - 2⁵ = 18122207 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 (18122539) 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, 4752 + ... + 7669.

It is an arithmetic number, because the mean of its divisors is an integer number (4534030).

Almost surely, 2^18122239 is an apocalyptic number.

18122239 is a deficient number, since it is larger than the sum of its proper divisors (13881).

18122239 is a wasteful number, since it uses less digits than its factorization.

18122239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13880.

The product of its digits is 1728, while the sum is 28.

The square root of 18122239 is about 4257.0223161266. The cubic root of 18122239 is about 262.6660548727. Note that the first 3 decimals are identical.

The spelling of 18122239 in words is "eighteen million, one hundred twenty-two thousand, two hundred thirty-nine".