18244290 has 64 divisors (see below), whose sum is σ = 46262016. Its totient is φ = 4595712.

The previous prime is 18244279. The next prime is 18244333. The reversal of 18244290 is 9244281.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 94434 + ... + 94626.

It is an arithmetic number, because the mean of its divisors is an integer number (722844).

Almost surely, 2^18244290 is an apocalyptic number.

18244290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18244290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23131008).

18244290 is an abundant number, since it is smaller than the sum of its proper divisors (28017726).

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

18244290 is a wasteful number, since it uses less digits than its factorization.

18244290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363.

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 18244290 is about 4271.3335154258. Note that the first 3 decimals coincide. The cubic root of 18244290 is about 263.2544102889.

Subtracting from 18244290 its reverse (9244281), we obtain a palindrome (9000009).

The spelling of 18244290 in words is "eighteen million, two hundred forty-four thousand, two hundred ninety".