18534213 has 12 divisors (see below), whose sum is σ = 26811148. Its totient is φ = 12337920.

The previous prime is 18534181. The next prime is 18534227. The reversal of 18534213 is 31243581.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 13417569 + 5116644 = 3663^2 + 2262^2 .

It is not a de Polignac number, because 18534213 - 2⁵ = 18534181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18534283) 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 11 ways as a sum of consecutive naturals, for example, 8181 + ... + 10197.

Almost surely, 2^18534213 is an apocalyptic number.

It is an amenable number.

18534213 is a deficient number, since it is larger than the sum of its proper divisors (8276935).

18534213 is a wasteful number, since it uses less digits than its factorization.

18534213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3044 (or 3041 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 18534213 is about 4305.1379768830. The cubic root of 18534213 is about 264.6415611997.

Adding to 18534213 its reverse (31243581), we get a palindrome (49777794).

The spelling of 18534213 in words is "eighteen million, five hundred thirty-four thousand, two hundred thirteen".