18313212 has 24 divisors (see below), whose sum is σ = 43174096. Its totient is φ = 6041088.

The previous prime is 18313189. The next prime is 18313223. The reversal of 18313212 is 21231381.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6703 + ... + 9030.

Almost surely, 2^18313212 is an apocalyptic number.

18313212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18313212 is an abundant number, since it is smaller than the sum of its proper divisors (24860884).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18313212 is a wasteful number, since it uses less digits than its factorization.

18313212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15837 (or 15835 counting only the distinct ones).

The product of its digits is 288, while the sum is 21.

The square root of 18313212 is about 4279.3938823156. The cubic root of 18313212 is about 263.5854950751.

Adding to 18313212 its reverse (21231381), we get a palindrome (39544593).

The spelling of 18313212 in words is "eighteen million, three hundred thirteen thousand, two hundred twelve".