18380211 has 8 divisors (see below), whose sum is σ = 24922560. Its totient is φ = 12045672.

The previous prime is 18380203. The next prime is 18380233. The reversal of 18380211 is 11208381.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18380211 - 2³ = 18380203 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18380251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51745 + ... + 52098.

It is an arithmetic number, because the mean of its divisors is an integer number (3115320).

Almost surely, 2^18380211 is an apocalyptic number.

18380211 is a deficient number, since it is larger than the sum of its proper divisors (6542349).

18380211 is a wasteful number, since it uses less digits than its factorization.

18380211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103905.

The product of its (nonzero) digits is 384, while the sum is 24.

The square root of 18380211 is about 4287.2148301665. The cubic root of 18380211 is about 263.9065469271.

Adding to 18380211 its reverse (11208381), we get a palindrome (29588592).

The spelling of 18380211 in words is "eighteen million, three hundred eighty thousand, two hundred eleven".