18291798 has 96 divisors (see below), whose sum is σ = 49029120. Its totient is φ = 5034960.

The previous prime is 18291787. The next prime is 18291821. The reversal of 18291798 is 89719281.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 81915 + ... + 82137.

It is an arithmetic number, because the mean of its divisors is an integer number (510720).

Almost surely, 2^18291798 is an apocalyptic number.

18291798 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18291798, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24514560).

18291798 is an abundant number, since it is smaller than the sum of its proper divisors (30737322).

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

18291798 is a wasteful number, since it uses less digits than its factorization.

18291798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279 (or 266 counting only the distinct ones).

The product of its digits is 72576, while the sum is 45.

The square root of 18291798 is about 4276.8911606446. The cubic root of 18291798 is about 263.4827164316.

The spelling of 18291798 in words is "eighteen million, two hundred ninety-one thousand, seven hundred ninety-eight".