18001854 has 48 divisors (see below), whose sum is σ = 44226000. Its totient is φ = 5246208.

The previous prime is 18001853. The next prime is 18001859. The reversal of 18001854 is 45810081.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18001853) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2422 + ... + 6470.

It is an arithmetic number, because the mean of its divisors is an integer number (921375).

Almost surely, 2^18001854 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18001854, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22113000).

18001854 is an abundant number, since it is smaller than the sum of its proper divisors (26224146).

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

18001854 is a wasteful number, since it uses less digits than its factorization.

18001854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4089 (or 4086 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 27.

The square root of 18001854 is about 4242.8591774887. The cubic root of 18001854 is about 262.0831369908.

The spelling of 18001854 in words is "eighteen million, one thousand, eight hundred fifty-four".