18238542 has 32 divisors (see below), whose sum is σ = 41893632. Its totient is φ = 5185344.

The previous prime is 18238523. The next prime is 18238553. The reversal of 18238542 is 24583281.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8578 + ... + 10490.

It is an arithmetic number, because the mean of its divisors is an integer number (1309176).

Almost surely, 2^18238542 is an apocalyptic number.

18238542 is an abundant number, since it is smaller than the sum of its proper divisors (23655090).

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

18238542 is a wasteful number, since it uses less digits than its factorization.

18238542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2152.

The product of its digits is 15360, while the sum is 33.

The square root of 18238542 is about 4270.6606046372. The cubic root of 18238542 is about 263.2267606281.

The spelling of 18238542 in words is "eighteen million, two hundred thirty-eight thousand, five hundred forty-two".