18042258 has 64 divisors (see below), whose sum is σ = 41368320. Its totient is φ = 5203968.

The previous prime is 18042251. The next prime is 18042289. The reversal of 18042258 is 85224081.

It is not an unprimeable number, because it can be changed into a prime (18042251) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 159610 + ... + 159722.

It is an arithmetic number, because the mean of its divisors is an integer number (646380).

Almost surely, 2^18042258 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18042258, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20684160).

18042258 is an abundant number, since it is smaller than the sum of its proper divisors (23326062).

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

18042258 is a wasteful number, since it uses less digits than its factorization.

18042258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243.

The product of its (nonzero) digits is 5120, while the sum is 30.

The square root of 18042258 is about 4247.6179206704. The cubic root of 18042258 is about 262.2790667112.

The spelling of 18042258 in words is "eighteen million, forty-two thousand, two hundred fifty-eight".