18388542 has 16 divisors (see below), whose sum is σ = 38712960. Its totient is φ = 5806872.

The previous prime is 18388529. The next prime is 18388547. The reversal of 18388542 is 24588381.

It is a self number, because there is not a number n which added to its sum of digits gives 18388542.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18388547) 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, 80538 + ... + 80765.

It is an arithmetic number, because the mean of its divisors is an integer number (2419560).

Almost surely, 2^18388542 is an apocalyptic number.

18388542 is an abundant number, since it is smaller than the sum of its proper divisors (20324418).

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

18388542 is a wasteful number, since it uses less digits than its factorization.

18388542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161327.

The product of its digits is 61440, while the sum is 39.

The square root of 18388542 is about 4288.1863299069. The cubic root of 18388542 is about 263.9464135958.

The spelling of 18388542 in words is "eighteen million, three hundred eighty-eight thousand, five hundred forty-two".