18302213 has 8 divisors (see below), whose sum is σ = 18727200. Its totient is φ = 17881168.

The previous prime is 18302203. The next prime is 18302231. The reversal of 18302213 is 31220381.

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

It is a cyclic number.

It is not a de Polignac number, because 18302213 - 2¹² = 18298117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18302203) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9695 + ... + 11427.

It is an arithmetic number, because the mean of its divisors is an integer number (2340900).

Almost surely, 2^18302213 is an apocalyptic number.

It is an amenable number.

18302213 is a deficient number, since it is larger than the sum of its proper divisors (424987).

18302213 is a wasteful number, since it uses less digits than its factorization.

18302213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1971.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 18302213 is about 4278.1085773973. The cubic root of 18302213 is about 263.5327142836.

Adding to 18302213 its reverse (31220381), we get a palindrome (49522594).

The spelling of 18302213 in words is "eighteen million, three hundred two thousand, two hundred thirteen".