18120212 has 12 divisors (see below), whose sum is σ = 34593216. Its totient is φ = 8236440.

The previous prime is 18120211. The next prime is 18120229. The reversal of 18120212 is 21202181.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18120211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 205868 + ... + 205955.

It is an arithmetic number, because the mean of its divisors is an integer number (2882768).

Almost surely, 2^18120212 is an apocalyptic number.

It is an amenable number.

18120212 is a deficient number, since it is larger than the sum of its proper divisors (16473004).

18120212 is a wasteful number, since it uses less digits than its factorization.

18120212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411838 (or 411836 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

The square root of 18120212 is about 4256.7842322580. The cubic root of 18120212 is about 262.6562613083.

Adding to 18120212 its reverse (21202181), we get a palindrome (39322393).

The spelling of 18120212 in words is "eighteen million, one hundred twenty thousand, two hundred twelve".