18266380 has 48 divisors (see below), whose sum is σ = 42416640. Its totient is φ = 6552000.

The previous prime is 18266371. The next prime is 18266387. The reversal of 18266380 is 8366281.

It is a Smith number, since the sum of its digits (34) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (18266387) 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 15 ways as a sum of consecutive naturals, for example, 16855 + ... + 17905.

It is an arithmetic number, because the mean of its divisors is an integer number (883680).

Almost surely, 2^18266380 is an apocalyptic number.

18266380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18266380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21208320).

18266380 is an abundant number, since it is smaller than the sum of its proper divisors (24150260).

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

18266380 is a wasteful number, since it uses less digits than its factorization.

18266380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1150 (or 1148 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 18266380 is about 4273.9185766694. The cubic root of 18266380 is about 263.3606160200.

Subtracting from 18266380 its reverse (8366281), we obtain a palindrome (9900099).

The spelling of 18266380 in words is "eighteen million, two hundred sixty-six thousand, three hundred eighty".