18280212 has 12 divisors (see below), whose sum is σ = 42653856. Its totient is φ = 6093400.

The previous prime is 18280189. The next prime is 18280217. The reversal of 18280212 is 21208281.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18280217) 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 3 ways as a sum of consecutive naturals, for example, 761664 + ... + 761687.

It is an arithmetic number, because the mean of its divisors is an integer number (3554488).

Almost surely, 2^18280212 is an apocalyptic number.

18280212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18280212 is an abundant number, since it is smaller than the sum of its proper divisors (24373644).

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

18280212 is a wasteful number, since it uses less digits than its factorization.

18280212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1523358 (or 1523356 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 24.

The square root of 18280212 is about 4275.5364575688. The cubic root of 18280212 is about 263.4270748173.

Adding to 18280212 its reverse (21208281), we get a palindrome (39488493).

The spelling of 18280212 in words is "eighteen million, two hundred eighty thousand, two hundred twelve".