18380212 has 12 divisors (see below), whose sum is σ = 32352516. Its totient is φ = 9136640.

The previous prime is 18380203. The next prime is 18380233. The reversal of 18380212 is 21208381.

It can be written as a sum of positive squares in 2 ways, for example, as 16289296 + 2090916 = 4036^2 + 1446^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12589 + ... + 13972.

It is an arithmetic number, because the mean of its divisors is an integer number (2696043).

Almost surely, 2^18380212 is an apocalyptic number.

It is an amenable number.

18380212 is a deficient number, since it is larger than the sum of its proper divisors (13972304).

18380212 is a wasteful number, since it uses less digits than its factorization.

18380212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26738 (or 26736 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 18380212 is about 4287.2149467924. The cubic root of 18380212 is about 263.9065517132.

Adding to 18380212 its reverse (21208381), we get a palindrome (39588593).

The spelling of 18380212 in words is "eighteen million, three hundred eighty thousand, two hundred twelve".