18385542 has 80 divisors (see below), whose sum is σ = 48694272. Its totient is φ = 5073840.

The previous prime is 18385529. The next prime is 18385547. The reversal of 18385542 is 24558381.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 18385497 and 18385506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18385547) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 34893 + ... + 35415.

Almost surely, 2^18385542 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18385542, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24347136).

18385542 is an abundant number, since it is smaller than the sum of its proper divisors (30308730).

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

18385542 is a wasteful number, since it uses less digits than its factorization.

18385542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 575 (or 566 counting only the distinct ones).

The product of its digits is 38400, while the sum is 36.

The square root of 18385542 is about 4287.8365174060. The cubic root of 18385542 is about 263.9320589630.

The spelling of 18385542 in words is "eighteen million, three hundred eighty-five thousand, five hundred forty-two".