18322213 has 16 divisors (see below), whose sum is σ = 23739520. Its totient is φ = 13732416.

The previous prime is 18322193. The next prime is 18322217. The reversal of 18322213 is 31222381.

It is a cyclic number.

It is not a de Polignac number, because 18322213 - 2⁵ = 18322181 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18322217) 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, 3570 + ... + 7027.

It is an arithmetic number, because the mean of its divisors is an integer number (1483720).

Almost surely, 2^18322213 is an apocalyptic number.

18322213 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

18322213 is a deficient number, since it is larger than the sum of its proper divisors (5417307).

18322213 is a wasteful number, since it uses less digits than its factorization.

18322213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10636.

The product of its digits is 576, while the sum is 22.

The square root of 18322213 is about 4280.4454207477. The cubic root of 18322213 is about 263.6286723624.

Adding to 18322213 its reverse (31222381), we get a palindrome (49544594).

The spelling of 18322213 in words is "eighteen million, three hundred twenty-two thousand, two hundred thirteen".