18540211 has 4 divisors (see below), whose sum is σ = 18713592. Its totient is φ = 18366832.

The previous prime is 18540209. The next prime is 18540227. The reversal of 18540211 is 11204581.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18540211 - 2¹ = 18540209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18540311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86530 + ... + 86743.

It is an arithmetic number, because the mean of its divisors is an integer number (4678398).

Almost surely, 2^18540211 is an apocalyptic number.

18540211 is a deficient number, since it is larger than the sum of its proper divisors (173381).

18540211 is a wasteful number, since it uses less digits than its factorization.

18540211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173380.

The product of its (nonzero) digits is 320, while the sum is 22.

The square root of 18540211 is about 4305.8345300302. The cubic root of 18540211 is about 264.6701056881.

Adding to 18540211 its reverse (11204581), we get a palindrome (29744792).

The spelling of 18540211 in words is "eighteen million, five hundred forty thousand, two hundred eleven".