18055422 has 72 divisors (see below), whose sum is σ = 49670712. Its totient is φ = 4687200.

The previous prime is 18055417. The next prime is 18055439. The reversal of 18055422 is 22455081.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 8772 + ... + 10632.

It is an arithmetic number, because the mean of its divisors is an integer number (689871).

Almost surely, 2^18055422 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18055422, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24835356).

18055422 is an abundant number, since it is smaller than the sum of its proper divisors (31615290).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18055422 is a wasteful number, since it uses less digits than its factorization.

18055422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1894 (or 1884 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

The square root of 18055422 is about 4249.1672125253. The cubic root of 18055422 is about 262.3428392588.

It can be divided in two parts, 1805 and 5422, that added together give a palindrome (7227).

The spelling of 18055422 in words is "eighteen million, fifty-five thousand, four hundred twenty-two".