18388242 has 32 divisors (see below), whose sum is σ = 41068800. Its totient is φ = 6098544.

The previous prime is 18388229. The next prime is 18388243. The reversal of 18388242 is 24288381.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 18388197 and 18388206.

It is not an unprimeable number, because it can be changed into a prime (18388243) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11623 + ... + 13109.

It is an arithmetic number, because the mean of its divisors is an integer number (1283400).

Almost surely, 2^18388242 is an apocalyptic number.

18388242 is an abundant number, since it is smaller than the sum of its proper divisors (22680558).

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

18388242 is a wasteful number, since it uses less digits than its factorization.

18388242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1727 (or 1721 counting only the distinct ones).

The product of its digits is 24576, while the sum is 36.

The square root of 18388242 is about 4288.1513499409. The cubic root of 18388242 is about 263.9449782028.

The spelling of 18388242 in words is "eighteen million, three hundred eighty-eight thousand, two hundred forty-two".