18706212 has 36 divisors (see below), whose sum is σ = 54040896. Its totient is φ = 5344560.

The previous prime is 18706151. The next prime is 18706213. The reversal of 18706212 is 21260781.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (18706213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36864 + ... + 37367.

It is an arithmetic number, because the mean of its divisors is an integer number (1501136).

Almost surely, 2^18706212 is an apocalyptic number.

18706212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18706212 is an abundant number, since it is smaller than the sum of its proper divisors (35334684).

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

18706212 is a wasteful number, since it uses less digits than its factorization.

18706212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74248 (or 74243 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 18706212 is about 4325.0678607393. The cubic root of 18706212 is about 265.4576735701.

Adding to 18706212 its reverse (21260781), we get a palindrome (39966993).

The spelling of 18706212 in words is "eighteen million, seven hundred six thousand, two hundred twelve".