18213206 has 8 divisors (see below), whose sum is σ = 29803464. Its totient is φ = 8278720.

The previous prime is 18213203. The next prime is 18213211. The reversal of 18213206 is 60231281.

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

It is a super-3 number, since 3×18213206³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18213203) 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 3 ways as a sum of consecutive naturals, for example, 413915 + ... + 413958.

It is an arithmetic number, because the mean of its divisors is an integer number (3725433).

Almost surely, 2^18213206 is an apocalyptic number.

18213206 is a deficient number, since it is larger than the sum of its proper divisors (11590258).

18213206 is a wasteful number, since it uses less digits than its factorization.

18213206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 827886.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 18213206 is about 4267.6932879484. The cubic root of 18213206 is about 263.1048173332.

Adding to 18213206 its reverse (60231281), we get a palindrome (78444487).

The spelling of 18213206 in words is "eighteen million, two hundred thirteen thousand, two hundred six".