18438211 has 16 divisors (see below), whose sum is σ = 20966400. Its totient is φ = 16063200.

The previous prime is 18438193. The next prime is 18438221. The reversal of 18438211 is 11283481.

It is a cyclic number.

It is not a de Polignac number, because 18438211 - 2⁵ = 18438179 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18438211.

It is not an unprimeable number, because it can be changed into a prime (18438221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47205 + ... + 47593.

It is an arithmetic number, because the mean of its divisors is an integer number (1310400).

Almost surely, 2^18438211 is an apocalyptic number.

18438211 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

18438211 is a deficient number, since it is larger than the sum of its proper divisors (2528189).

18438211 is a wasteful number, since it uses less digits than its factorization.

18438211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 570.

The product of its digits is 1536, while the sum is 28.

The square root of 18438211 is about 4293.9738005721. The cubic root of 18438211 is about 264.1838471092.

It can be divided in two parts, 184382 and 11, that multiplied together give a palindrome (2028202).

The spelling of 18438211 in words is "eighteen million, four hundred thirty-eight thousand, two hundred eleven".